MB-25226 invalidate roles cache during cluster initialization
MB-25226 invalidate roles cache during cluster initialization

because roles for anonymous differ on initialized and non initialized
clusters

Change-Id: Ib575b8b3a720eb520bedb4718ce8608868f9acf7
Reviewed-on: http://review.couchbase.org/81138
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

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