Add dependency management for Ehcache 3

Closes gh-5725

spring-boot-dependencies/pom.xml

@@ -69,6 +69,7 @@
 		<dom4j.version>1.6.1</dom4j.version>
 		<dropwizard-metrics.version>3.1.2</dropwizard-metrics.version>
 		<ehcache.version>2.10.1</ehcache.version>
+		<ehcache3.version>3.0.0</ehcache3.version>
 		<embedded-mongo.version>1.50.2</embedded-mongo.version>
 		<flyway.version>3.2.1</flyway.version>
 		<freemarker.version>2.3.23</freemarker.version>
@@ -1564,6 +1565,11 @@
 				<artifactId>websocket-server</artifactId>
 				<version>${jetty.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>org.ehcache</groupId>
+				<artifactId>ehcache</artifactId>
+				<version>${ehcache3.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>org.elasticsearch</groupId>
 				<artifactId>elasticsearch</artifactId>

spring-boot-samples/spring-boot-sample-cache/pom.xml

@@ -49,6 +49,12 @@
 		</dependency>
 		-->
 		<!--
+		<dependency>
+			<groupId>org.ehcache</groupId>
+			<artifactId>ehcache</artifactId>
+		</dependency>
+		-->
+		<!--
 		<dependency>
 			<groupId>com.hazelcast</groupId>
 			<artifactId>hazelcast</artifactId>

spring-boot-samples/spring-boot-sample-cache/src/main/resources/ehcache3.xml

+<config xmlns='http://www.ehcache.org/v3'
+		xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
+		xsi:schemaLocation="http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd">
+
+	<cache alias="countries">
+		<expiry>
+			<ttl unit="seconds">600</ttl>
+		</expiry>
+		<heap unit="entries">200</heap>
+	</cache>
+
+</config>
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