MB-100: init_cluster_port = init_cluster in Rest client

Change-Id: I2577c1a8575fcfeb5b354109e76dbc58b93352af
Reviewed-on: http://review.couchbase.org/23716
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>