Bug 1127818 - Configuration of EAP 6 datasource resource is invalid when a
system property is used in configuration for pool sizes

max/min-pool-size config properties changed to string type.

(cherry picked from commit 0819241a4b78ee26cb7978b5dd5bbf5dc770beb6)
Signed-off-by: Libor Zoubek <lzoubek@redhat.com>