CBST-11: remove sharing of mset/mget couchbase connections

mget was sharing the connection from mset maybe
causing conflict in _hosts param

Change-Id: Ib713c6e4c61365247844838bad048a2e39a883a3
Reviewed-on: http://review.couchbase.org/30344
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: Tommie McAfee <tommie@couchbase.com>