[WFLY-2609] Work around inconsistent deployment/subdeployment resource r...

...egistrations for JPA

My previous PR for WFLY-2609 doesn't work with how the connector subystems register deployment resources, and perhaps the general idea of WFLY-2609 is invalid, and DUPs should specifically register their models under the appropriate places under deployment=x and/or deployment=x/subdeployment=y.

This commit does that kind of registration for the JPA subsystem resources that led to WFLY-2609 being filed.