Fix functional.base.TestCase.openstack() to optionally omit --os-auth-type
Fix functional.base.TestCase.openstack() to optionally omit --os-auth-type

Change the functional test TestCase.openstack() method to add a
way to not include the --os-auth-type option in order to test the
default auth-type logic.

Change-Id: I0f1ca2f7517a41278afaad5aaf4e98accb16bea2
Signed-off-by: Dean Troyer <8b9d4b97f386f6f54679ab5c0c082ebdb224d70a@gmail.com>

openstack/python-openstackclient,dtroyer/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient