Fix --delegate arg compatibility
Fix --delegate arg compatibility

Fixes TOOLS-303

nagyistoce/euca2ools,vasiliykochergin/euca2ools,vasiliykochergin/euca2ools,jhajek/euca2ools,gholms/euca2ools,nagyistoce/euca2ools,gholms/euca2ools,jhajek/euca2ools