WFLY-3606 Porting to IronJacamar 1.2.Beta3

Does this truly have no default value? That would imply something like

if (!BACKGROUNDVALIDATION.isUndefined()) {
    backGroundValidation = !VALIDATE_ON_MATCH.isDefined() && ...
} 

i.e. what IJ does in the undefined case depends on some external factor. OTOH, if it's not turned on unless this attribute is set to true, the metadata should still report a default value of 'false'.

I'm checking because I wonder if dropping this default is to be able to get a 'null' at code like RaOperationUtil L237 instead of getting the default. If it is, L237 should use a different algorithm to read the attribute value, one that ignores the default value if the attribute is undefined. The read-resource-description metadata should still tell the user what the effective default is.