Remove add_option() method
Remove add_option() method

argparse just has an add_argument() method, so there's no reason for us
to keep add_option() around.

Change-Id: I6f4be089ceaf0fd8c4c99565af392b445916172e

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator