Crash service_agent if we see unexpected rebalance tasks.
Crash service_agent if we see unexpected rebalance tasks.

So it's easier to spot misbehaving services.

Change-Id: I6740f8c803c56b0650ffb51cbc412f11dd832da5
Reviewed-on: http://review.couchbase.org/75511
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>

ceejatec/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,membase/ns_server