Add JMS health indicator

Define an additional health indicator for each ConnectionFactory instance
defined in the context. Extracts the provider name from the connection
meta-data.

Fixes gh-2016

spring-boot-actuator/pom.xml

@@ -56,6 +56,11 @@
 			<artifactId>javax.servlet-api</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.activemq</groupId>
+			<artifactId>activemq-broker</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.hibernate</groupId>
 			<artifactId>hibernate-validator</artifactId>