Support domain jcr:uuid facetrule referencing a node path without mix:referenceable

Current a domain jcr:uuid facetrule requires a Reference value node path to point to a node having mixin mix:referenceable.
This rule (QFacetRule.java) just can use node.getIdentifier() instead of node.getUUID().toString(), thus relaxing this requirement and no longer requires this mixin.

In addition, to support the access rule evaluation, the HippoAccessManager also needs to compare the facetrule value against the node id, as property jcr:uuid might not be available.