Add JDBC Cache Store config to RHQ plugin

ISPN-3350 was added to enhance some of the RHQ endpoints to allow for better runtime configuration support. However ISPN-3290 is also concurrently changing cache stores. Some changes for ISPN-3290 were mentioned to be possibly changing how the JDBC cache stores are configured and as such this has been excluded from ISPN-3350 to not implement it twice.

This is just to add in the support JDBC cache stores as they are missing.