Make user removals and traversals thread safe in meetme.

Race conditions present in meetme involving the user list where a lack of
locking has the potential for a user to be removed during a traversal or as in
the case of the reporter after checking if the list is empty could cause a
crash. Fixing this was done by convering the userlist to an ao2 container.

(closes issue #17390)
Reported by: Vince

Review: https://reviewboard.asterisk.org/r/746/


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@275773 f38db490-d61c-443f-a65b-d21fe96a405b

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