WFLY-2502 Naming context read-only during RA stop

When the ResourceAdapter#stop() method is invoked on an annotation
based 1.6 JCR resource adapter the naming context is read only. The
method can be invoked in two cases. Either a normal undeployment or
a clean up after a failed deployment.

 - AbstractResourceAdapterDeploymentService#stopAsync pushes the owner
 - AbstractResourceAdapterDeploymentService#unregisterAll catches any
   error that ResourceAdapter#stop may throw and logs it
 - AbstractResourceAdapterDeploymentService#cleanupStartAsync also
   pushes the owner
 - fix an unused import
 - convert various tabs to spaces
 - remove various trailing spaces

Issue: WFLY-2502
https://issues.jboss.org/browse/WFLY-2502