Adjusted CLI argument names to use dashes rather than underscores
Adjusted CLI argument names to use dashes rather than underscores

Change-Id: I5dd5434ec482de0759a0ccfa22485cb5b2d196ca
Closes-bug: 1408667

ramielrowe/python-magnumclient,ramielrowe/python-magnumclient,openstack/python-magnumclient