disable cluster manager for now.

Change-Id: Ibcec9c7e3d04922dfebad2e4284537e52ac26119
Reviewed-on: http://review.couchbase.org/40560
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>