MB-9775: Consider groupname option for rebalance
MB-9775: Consider groupname option for rebalance

Change-Id: Icf5a3c51635be14b5c224e61d91440eb9e1a669c
Reviewed-on: http://review.couchbase.org/31307
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>

couchbase/couchbase-cli,couchbase/couchbase-cli