[GSS](6.3.z) HTTP 405 Error when retrieving process image via REST when running on WebSphere

emphasized textAfter configuring business-central according to https://access.redhat.com/solutions/1393243, and build/deploy of kjar. Requests to
/rest/runtime/DEPLOYMENT_ID/process/PROCESS_ID/image return 405, with the following error in the logs:

[6/7/16 16:06:04:143 EDT] 000000ac ResourceRegis I org.apache.wink.server.internal.registry.ResourceRegistry filterDispatchMethods The system cannot find any method in the org.jbpm.console.ng.rest.ProcessImageResourceImpl class that supports GET. Verify that a method exists.
[6/7/16 16:06:04:148 EDT] 000000ac RequestProces I org.apache.wink.server.internal.RequestProcessor logException The following error occurred during the invocation of the handlers chain: WebApplicationException (405) with message 'null' while processing GET request sent to http://localhost:9080/business-central/rest/runtime/example:diagram-test:1.0/process/diagram-test.process/image

This is similar to https://issues.jboss.org/browse/RHBPMS-816. The @Path("/") at https://github.com/droolsjbpm/jbpm-console-ng/blob/master/jbpm-console-ng-rest/src/main/java/org/jbpm/console/ng/rest/ProcessImageResourceImpl.java#L116 should be dropped.