Add unit tests for cli.output_parser

This commit adds unit tests for cli.output_parser.

Partially implements bp unit-tests

Change-Id: Ib5d2df61b791e9d76e0897609eb753e7440558ae
Enable one flavor tests

Remove skip decorator for test_list_non_public_flavor in
api/compute/v3/admin/test_flavors.py as bug/1209101 was fixed.

Change-Id: I6f8ac575b0d9e512bbc57d8343e72fa4af0214a2
Closes-Bug: #1300606
Merge "Enable one flavor tests"
Merge "Add unit tests for cli.output_parser"
Merge branch 'master' of https://github.com/openstack/tempest