REST fine grained security support

Currently the REST server requires authentication but does not offer authorization capabilities. The new REST API described in ISPN-8535 requires that invocations on resources can be restricted on a per user/role basis.

Examples:
/GET on /rest/v2/

{cacheName} should be allowed for all authenticated users

/POST on /rest/v2/{cacheName}

should be restricted to users having the ADMIN role

Role MONITOR could have permission only to do GET on /rest/v2/caches/mycache/stats