Updated openstack/openstack
Project: openstack/cliff  6fecd14c0528b00fdd0e8e59f247d751edf6a290

The --variable option to shell format is redundant

The --variable option to the shell format is redundant to the
--column option and it adds to the clutter.

Change-Id: I0e3dbca8272d1503df3188dbba00afa902dbd34b
Closes-Bug: #1320629