Initial spirng-session-data-geode setup.

(cherry picked from commit c5a1ee021016d37dda5e5eb96320ee1be9869314)
Signed-off-by: John Blum <jblum@pivotal.io>

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

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+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	   xmlns:context="http://www.springframework.org/schema/context"
+	   xmlns:gfe="http://www.springframework.org/schema/gemfire"
+	   xmlns:p="http://www.springframework.org/schema/p"
+	   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/context http://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/util http://www.springframework.org/schema/util/spring-util.xsd
+">
+
+	<!-- tag::beans[] -->
+	<!--1-->
+	<context:annotation-config/>
+
+	<!--2-->
+	<context:property-placeholder location="classpath:META-INF/spring/application.properties"/>
+
+	<!--3-->
+	<bean class="sample.GemFireClientServerReadyBeanPostProcessor"/>
+
+	<!--4-->
+	<util:properties id="gemfireProperties">
+		<!--<prop key="log-file">gemfire-client.log</prop>-->
+		<prop key="log-level">${spring.session.data.gemfire.log-level:warning}</prop>
+	</util:properties>
+
+	<!--5-->
+	<gfe:client-cache properties-ref="gemfireProperties" pool-name="gemfirePool"/>
+
+	<!--6-->
+	<gfe:pool keep-alive="false"
+              ping-interval="5000"
+              read-timeout="15000"
+              retry-attempts="1"
+              subscription-enabled="true"
+              thread-local-connections="false">
+		<gfe:server host="${application.gemfire.client-server.host}"
+                    port="${spring.session.data.gemfire.port:${application.gemfire.client-server.port}}"/>
+	</gfe:pool>
+
+	<!--7-->
+	<bean class="org.springframework.session.data.gemfire.config.annotation.web.http.GemFireHttpSessionConfiguration"
+		  p:maxInactiveIntervalInSeconds="30" p:poolName="DEFAULT"/>
+	<!-- end::beans[] -->
+
+</beans>

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

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+<?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">
+	<!--
+	- Location of the XML file that defines the root application context
+	- Applied by ContextLoaderListener.
+	-->
+	<!-- tag::context-param[] -->
+	<context-param>
+		<param-name>contextConfigLocation</param-name>
+		<param-value>/WEB-INF/spring/session-client.xml</param-value>
+	</context-param>
+	<!-- end::context-param[] -->
+
+	<!-- tag::springSessionRepositoryFilter[] -->
+	<filter>
+		<filter-name>springSessionRepositoryFilter</filter-name>
+		<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
+	</filter>
+	<filter-mapping>
+		<filter-name>springSessionRepositoryFilter</filter-name>
+		<url-pattern>/*</url-pattern>
+		<dispatcher>REQUEST</dispatcher>
+		<dispatcher>ERROR</dispatcher>
+	</filter-mapping>
+	<!-- end::springSessionRepositoryFilter[] -->
+
+	<!--
+	- Loads the root application context of this web app at startup.
+	- The application context is then available via
+	- WebApplicationContextUtils.getWebApplicationContext(servletContext).
+	-->
+	<!-- tag::listeners[] -->
+	<listener>
+		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
+	</listener>
+	<!-- end::listeners[] -->
+
+	<servlet>
+		<servlet-name>session</servlet-name>
+		<servlet-class>sample.SessionServlet</servlet-class>
+	</servlet>
+
+	<servlet-mapping>
+		<servlet-name>session</servlet-name>
+		<url-pattern>/session</url-pattern>
+	</servlet-mapping>
+
+	<welcome-file-list>
+		<welcome-file>index.jsp</welcome-file>
+	</welcome-file-list>
+</web-app>

samples/xml/gemfire-clientserver/src/main/webapp/index.jsp

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+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%@ taglib prefix="wj" uri="http://www.webjars.org/tags" %>
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<title>Session Attributes</title>
+	<wj:locate path="bootstrap.min.css" relativeTo="META-INF/resources" var="bootstrapCssLocation"/>
+	<link rel="stylesheet" href="<c:url value="${bootstrapCssLocation}"/>">
+	<style type="text/css">
+		body {
+			padding: 1em;
+		}
+	</style>
+</head>
+<body>
+	<div class="container">
+		<h1>Description</h1>
+		<p>This application demonstrates how to use a GemFire instance to back your session. Notice that there is no JSESSIONID cookie. We are also able to customize the way of identifying what the requested session id is.</p>
+
+		<h1>Try it</h1>
+
+		<form class="form-inline" role="form" action="./session" method="post">
+			<label for="attributeName">Attribute Name</label>
+			<input id="attributeName" type="text" name="attributeName"/>
+			<label for="attributeValue">Attribute Value</label>
+			<input id="attributeValue" type="text" name="attributeValue"/>
+			<input type="submit" value="Set Attribute"/>
+		</form>
+
+		<hr/>
+
+		<table class="table table-striped">
+			<thead>
+			<tr>
+				<th>Attribute Name</th>
+				<th>Attribute Value</th>
+			</tr>
+			</thead>
+			<tbody>
+			<c:forEach items="${sessionScope}" var="attr">
+				<tr>
+					<td><c:out value="${attr.key}"/></td>
+					<td><c:out value="${attr.value}"/></td>
+				</tr>
+			</c:forEach>
+			</tbody>
+		</table>
+	</div>
+</body>
+</html>