Fix EZP-22174: Respect site.ini\[RoleSettings]\EnableCaching setting in eZUser::purgeUserCacheByUserId() and eZUser::getUserCacheByUserId()
Fix EZP-21820: eZUser::getUserCacheByUserId() may return an eZClusterFileFailure instead of an array
Merge pull request #861 from guillaumelecerf/EZP-21820

Fix EZP-21820: eZUser::getUserCacheByUserId() may return an eZClusterFil...
Merge pull request #860 from guillaumelecerf/respect_RoleSettings_EnableCaching

Fix EZP-22174: Respect site.ini\[RoleSettings]\EnableCaching setting in eZUser::purgeUs...