Improve output of supported API versions
Improve output of supported API versions

Sort supported versions properly for better look.

Change-Id: I6c2f5ecc04cf14ea5bf1b214cb303fcc9783af3f
Closes-Bug: #1630962

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