Fixed meetme tab completion and command documentation.

* Removed unnecessary case sensitivity in meetme list, lock, unlock, mute,
unmute, and kick commands.

* Separated meetme lock/unlock, mute/unmute, and kick commands into their
own registered commands to simplify tab completion and parameter checking.
meetme_lock_cmd(), meetme_mute_cmd(), and meetme_kick_cmd()

* Simplified meetme_show_cmd()

(closes issue AST-1006)
Reported by: John Bigelow
Tested by: rmudgett
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Merged revisions 373815 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 373816 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 373818 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@373835 65c4cc65-6c06-0410-ace0-fbb531ad65f3