MB-22752 use strings for auth and permissions versions in LRU caches
MB-22752 use strings for auth and permissions versions in LRU caches

submit together with:
http://review.couchbase.org/78167/

Change-Id: Ic4625e7aef60bd27c8cfad72e1acc03334823f69
Reviewed-on: http://review.couchbase.org/78168
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Well-Formed: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

couchbase/cbauth,couchbase/cbauth