[WFLY-3733] ChannelInstanceResourceDefinition doesn't expose non-pri...

Jira
https://issues.jboss.org/browse/WFLY-3733

Now you can also access non-primitive types such as AtomicLong

	[standalone@localhost:9990 /] /subsystem=jgroups/channel=web/protocol=FRAG2:read-attribute(name=num_frags_sent)
	{
	    "outcome" => "success",
	    "result" => "0"
	}

Unfortunately the annotated methods cannot exposed https://issues.jboss.org/browse/WFLY-3733?focusedCommentId=12993380&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12993380.