URL Cleanup.

This commit updates URLs to prefer the https protocol. Redirects are not followed to avoid accidentally expanding intentionally shortened URLs (i.e. if using a URL shortener).

These URLs were fixed, but the https status was not OK. However, the https status was the same as the http request or http redirected to an https URL, so they were migrated. Your review is recommended.

* [ ] http://www.puppycrawl.com/dtds/configuration_1_3.dtd (404) with 1 occurrences migrated to:
  https://www.puppycrawl.com/dtds/configuration_1_3.dtd ([https](https://www.puppycrawl.com/dtds/configuration_1_3.dtd) result 404).

These URLs were switched to an https URL with a 2xx status. While the status was successful, your review is still recommended.

* [ ] http://www.springframework.org/schema/beans/spring-beans.xsd with 4 occurrences migrated to:
  https://www.springframework.org/schema/beans/spring-beans.xsd ([https](https://www.springframework.org/schema/beans/spring-beans.xsd) result 200).
* [ ] http://www.springframework.org/schema/context/spring-context.xsd with 3 occurrences migrated to:
  https://www.springframework.org/schema/context/spring-context.xsd ([https](https://www.springframework.org/schema/context/spring-context.xsd) result 200).
* [ ] http://www.springframework.org/schema/gemfire/spring-gemfire.xsd with 4 occurrences migrated to:
  https://www.springframework.org/schema/gemfire/spring-gemfire.xsd ([https](https://www.springframework.org/schema/gemfire/spring-gemfire.xsd) result 200).
* [ ] http://www.springframework.org/schema/util/spring-util.xsd with 4 occurrences migrated to:
  https://www.springframework.org/schema/util/spring-util.xsd ([https](https://www.springframework.org/schema/util/spring-util.xsd) result 200).
* [ ] http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd with 2 occurrences migrated to:
  https://java.sun.com/xml/ns/javaee/web-app_3_0.xsd ([https](https://java.sun.com/xml/ns/javaee/web-app_3_0.xsd) result 302).

These URLs were intentionally ignored.

* http://java.sun.com/xml/ns/javaee with 4 occurrences
* http://www.springframework.org/schema/beans with 8 occurrences
* http://www.springframework.org/schema/context with 6 occurrences
* http://www.springframework.org/schema/gemfire with 8 occurrences
* http://www.springframework.org/schema/p with 4 occurrences
* http://www.springframework.org/schema/util with 8 occurrences
* http://www.w3.org/2001/XMLSchema-instance with 6 occurrences

Resolves gh-33.

config/checkstyle/checkstyle.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-		"http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
+		"https://www.puppycrawl.com/dtds/configuration_1_3.dtd">
 <module name="Checker">
 	<!-- Suppressions -->
 	<module name="SuppressionFilter">

samples/xml/gemfire-clientserver/src/main/resources/META-INF/spring/session-server.xml

@@ -6,10 +6,10 @@
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
-	   	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+	   	http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
+		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
-        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+        http://www.springframework.org/schema/gemfire https://www.springframework.org/schema/gemfire/spring-gemfire.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 ">
 
 	<!-- tag::beans[] -->

samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/spring/session-client.xml

@@ -6,10 +6,10 @@
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
-	   	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+	   	http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
+		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
-        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+        http://www.springframework.org/schema/gemfire https://www.springframework.org/schema/gemfire/spring-gemfire.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 ">
 
 	<!-- tag::beans[] -->

samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/web.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
+		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 	<!--
 	- Location of the XML file that defines the root application context
 	- Applied by ContextLoaderListener.

samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/spring/session.xml

@@ -6,10 +6,10 @@
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
-	   	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+	   	http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
+		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
-        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+        http://www.springframework.org/schema/gemfire https://www.springframework.org/schema/gemfire/spring-gemfire.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 ">
 
 	<!-- tag::beans[] -->

samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/web.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
+		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 	<!--
 	- Location of the XML file that defines the root application context
 	- Applied by ContextLoaderListener.

spring-session-data-geode/src/test/resources/org/springframework/session/data/gemfire/config/annotation/web/http/GemFireHttpSessionXmlConfigurationTests-context.xml

@@ -5,9 +5,9 @@
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
-	   	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+	   	http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
-        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+        http://www.springframework.org/schema/gemfire https://www.springframework.org/schema/gemfire/spring-gemfire.xsd
-        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+        http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 ">
 
 	<util:properties id="gemfireProperties">