[WFLY-3471] JMSContext injection

* fix JMSContext injection to use the correct CDI scope (request or
  transaction) depending on the presence of a transaction.
* Inject @RequestScoped and @TransactionScoped beans to let CDI handle
  the bean lifecycle.
* move injection code in the
  org.wildfly.extension.messaging.activemq.deployment.injection package
* add test asserting that a @RequestScoped injected JMSContext is
  properly cleaned up at the end of the request

JIRA: https://issues.jboss.org/browse/WFLY-3471

feature-pack/src/main/resources/modules/system/layers/base/org/wildfly/extension/messaging-activemq/main/module.xml

@@ -67,6 +67,7 @@
         <module name="org.jboss.as.connector" />
         <module name="org.jboss.as.security"/>
         <module name="org.jboss.vfs"/>
+        <module name="org.jboss.jts"/>
         <module name="org.picketbox"/>
         <module name="org.jboss.jboss-transaction-spi"/>
         <module name="org.jboss.remote-naming"/>

messaging-activemq/src/main/java/org/wildfly/extension/messaging/activemq/MessagingSubsystemAdd.java

@@ -29,7 +29,6 @@
 import org.jboss.as.server.DeploymentProcessorTarget;
 import org.jboss.as.server.deployment.Phase;
 import org.jboss.dmr.ModelNode;
-import org.wildfly.extension.messaging.activemq.deployment.CDIDeploymentProcessor;
 import org.wildfly.extension.messaging.activemq.deployment.DefaultJMSConnectionFactoryBindingProcessor;
 import org.wildfly.extension.messaging.activemq.deployment.DefaultJMSConnectionFactoryResourceReferenceProcessor;
 import org.wildfly.extension.messaging.activemq.deployment.JMSConnectionFactoryDefinitionAnnotationProcessor;
@@ -39,6 +38,7 @@
 import org.wildfly.extension.messaging.activemq.deployment.MessagingDependencyProcessor;
 import org.wildfly.extension.messaging.activemq.deployment.MessagingXmlInstallDeploymentUnitProcessor;
 import org.wildfly.extension.messaging.activemq.deployment.MessagingXmlParsingDeploymentUnitProcessor;
+import org.wildfly.extension.messaging.activemq.deployment.injection.CDIDeploymentProcessor;
 
 /**
  * Add handler for the messaging subsystem.