CBQE-819: max queued msg arg should be tuple/list

Change-Id: I6e3a45ab600c2fb00a78392a494276255fa120a8
Reviewed-on: http://review.couchbase.org/24840
Tested-by: Tommie McAfee <tommie@couchbase.com>
Reviewed-by: Thuan Nguyen <soccon@gmail.com>