Deduplicate CLI output parser code in test.py
Deduplicate CLI output parser code in test.py

Use methods from tempest-lib.cli.output_parser.

Change-Id: I0655141a0ef967675e41b1da49cf999da3382018

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