Ensure listed queues are not offered for completion

When using tab-completion for the list of queues on "queue reset stats"
or "queue reload {all|members|parameters|rules}", the tab-completion
listing for further queues erroneously listed queues that had already
been added to the list. The tab-completion listing now only displays
queues that are not already in the list.

(closes issue AST-963)
Reported-by: John Bigelow
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Merged revisions 372517 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 372518 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@372519 65c4cc65-6c06-0410-ace0-fbb531ad65f3