Fix HTTP urls to HTTPS

* Do not fix urls for the `http://apache.org/xml/features` when we
configure XML components
* Do not fix urls for localhost and fake links in tests
* Fix all the dead links in docs

spring-integration-xml/src/main/resources/org/springframework/integration/xml/config/spring-integration-xml-5.2.xsd

@@ -10,7 +10,7 @@
 	<xsd:import namespace="http://www.springframework.org/schema/beans" />
 	<xsd:import namespace="http://www.springframework.org/schema/tool" />
 	<xsd:import namespace="http://www.springframework.org/schema/integration"
-			schemaLocation="http://www.springframework.org/schema/integration/spring-integration-5.2.xsd"/>
+			schemaLocation="https://www.springframework.org/schema/integration/spring-integration-5.2.xsd"/>
 
 	<xsd:annotation>
 		<xsd:documentation>

spring-integration-xml/src/test/java/org/springframework/integration/xml/config/TestXmlApplicationContextHelper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,13 +34,13 @@ public class TestXmlApplicationContextHelper {
 			+ "xmlns:context='http://www.springframework.org/schema/context' "
 			+ "xsi:schemaLocation="
 			+ "'http://www.springframework.org/schema/beans "
-			+ "http://www.springframework.org/schema/beans/spring-beans.xsd "
+			+ "https://www.springframework.org/schema/beans/spring-beans.xsd "
 			+ "http://www.springframework.org/schema/integration "
-			+ "http://www.springframework.org/schema/integration/spring-integration.xsd "
+			+ "https://www.springframework.org/schema/integration/spring-integration.xsd "
 			+ "http://www.springframework.org/schema/integration/xml "
-			+ "http://www.springframework.org/schema/integration/xml/spring-integration-xml.xsd "
-			+ "http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd " +
-			"http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd' >" +
+			+ "https://www.springframework.org/schema/integration/xml/spring-integration-xml.xsd "
+			+ "http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd " +
+			"http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd' >" +
 			"<context:annotation-config/>";
 
 	private static final String footer = "</beans>";

spring-integration-xml/src/test/java/org/springframework/integration/xml/config/chain-elements-config.properties

@@ -4,9 +4,9 @@ xmlheaders=\
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" \
 	xmlns:int="http://www.springframework.org/schema/integration" \
 	xmlns:int-xml="http://www.springframework.org/schema/integration/xml" \
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd \
-		http://www.springframework.org/schema/integration/xml http://www.springframework.org/schema/integration/xml/spring-integration-xml.xsd \
-		http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd \
+		http://www.springframework.org/schema/integration/xml https://www.springframework.org/schema/integration/xml/spring-integration-xml.xsd \
+		http://www.springframework.org/schema/integration https://www.springframework.org/schema/integration/spring-integration.xsd">
 xmlfooter= </beans>
 
 xpath-transformer=<int:chain input-channel="input">\

spring-integration-xml/src/test/java/org/springframework/integration/xml/config/validationTestsSchema.xsd

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.example.org/validationTestsSchema" xmlns:tns="http://www.example.org/validationTestsSchema" elementFormDefault="qualified">
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="https://www.example.org/validationTestsSchema" xmlns:tns="https://www.example.org/validationTestsSchema" elementFormDefault="qualified">
 
     <xsd:element name="greeting" type="xsd:string"/>
     

spring-integration-xml/src/test/java/org/springframework/integration/xml/router/validationTestsSchema.xsd

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.example.org/validationTestsSchema" xmlns:tns="http://www.example.org/validationTestsSchema" elementFormDefault="qualified">
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="https://www.example.org/validationTestsSchema" xmlns:tns="https://www.example.org/validationTestsSchema" elementFormDefault="qualified">
 
     <xsd:element name="greeting" type="xsd:string"/>