CLI usability: operations that shutdown the server-side management interface result in "Communication error"

If you shutdown the server, you get an error:

[standalone@localhost:9999 /] :shutdown
Communication error: Channel closed
Closed connection to localhost:9999

Even though its considered by this comment clean - https://issues.jboss.org/browse/AS7-689?focusedCommentId=12614756&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12614756 - I is not really clean as you get an error but termination of the channel can be anticipated. Users might be confused now knowing if its an actual error or not. For example take a look at SSH.

The same basic issue exists for the :reload operation.