CBQE-1845 test zone available when
upgrade cluster from community edition to enterprise edition

Change-Id: I92667e2ffda2849dedb20310c02387a10b020ca3
Reviewed-on: http://review.couchbase.org/34746
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>