Remove unused ns_memcached:sync_bucket_config API.
Remove unused ns_memcached:sync_bucket_config API.

Change-Id: Ib3fb5353bf36daab2ca38a15d9adb9c3eea87b49
Reviewed-on: http://review.couchbase.org/78945
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

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