Refactor of listservers to accomodate rebalance functionality.
Refactor of listservers to accomodate rebalance functionality.

Change-Id: I6ad35819a369f3dd59696420a6cdd8164f8e1d9b
Reviewed-on: http://review.northscale.com:8080/381
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

couchbaselabs/couchbase-cli,membase/membase-cli,membase/membase-cli,couchbaselabs/couchbase-cli,couchbase/couchbase-cli,couchbase/couchbase-cli,couchbaselabs/couchbase-cli,membase/membase-cli