This is the first step in reworking the shell argument handling,
clean up and add tests to ensure functionality doesn't change.
* Rework shell tests to break down global options and auth options.
* Make tests table-driven
* Remove 'os_' from 'cacert' and 'default_domain' internal option names
Change-Id: Icf69c7e84f3f44b366fe64b6bbf4e3fe958eb302
a05cbf4c99