Add and require conf-file argument

* The user can now pass in a tempest configuration file to the
  refstack-client script. A tempest config file is now required.
* The tempest script was changed from run_tests.sh to run_tempest.sh
  as run_tests.sh is meant for the tempest unit tests.
* Made it so test results are printed out only with a verbosity count
  of two.
* Deprecated/broken code was removed.
* We now keep track of where the subunit data is saved.

Change-Id: I8a98f45c2f50368512d711a675a07dea7e23ad04