MB-11314 add version of permissions to cbauth cache
MB-11314 add version of permissions to cbauth cache

...so the cache can be refreshed if it changes

Change-Id: I87dbba8436506d3117b645a7ad94240fa27ae37d
Reviewed-on: http://review.couchbase.org/58679
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>

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