[EAPCD] - tx recovery and dropped database drivers

The existing EAP OpenShift tx-recovery modules have:

<module name="org.postgresql" optional="true"/>
<module name="com.mysql" optional="true"/>

But these drivers have been dropped from newer EAP images moving forwards.

In addition it raises other questions about what if customers want to use a 3rd party driver etc. (for example db2, oracle or mssql).

Is there a more generic mechanism that can be used here?

Moving forward Galleon would probably be used to configure these etc, so there may be some opportunity to make some improvements there.