There are still a couple of modules that use their own lists, but that should not prevent this merge, those should be adapted to use this list in subsequent patch
raiseStandardError("Region %s does not seem to be available for aws module %s. If the region definitely exists, you may need to upgrade boto"%(region,aws_module.__name__))
else:
raiseStandardError("Unknown problem connecting to region %s for aws module %s."%(region,aws_module.__name__))