Clean up style

* Do not use '==' with '['; '[[' is preferred
* Fix unquoted args to -z|-n

Change-Id: I8d6bf50b8da0b47c8a5082b4fbe8b24adda09b43
Generate Tempest service list rather than hard-code it

Change-Id: I208efd7fd0798b18ac2e6353ee70b773e84a2683
Merge branch 'code-cleanup' into dt-test