(unfinished) test service functions

Move service function tests to stand-alone file

Change-Id: I3f4628b8dd55fa7819e7b697fe621861a582bbbc
Add config_tempest

Build a Tempest config from external could configuration

Change-Id: I80016c1f03a7cfcb52250da63de0e96d5f94c4af
Refresh exercise scripts

* Use OSC in client-args.sh

Change-Id: Ic97681c22e4ace6bf84dd3afc25161bc5d2cbae8
Merge branch 'screen-logdir' into dt-test
Merge branch 'clean-wsgi' into dt-test
Merge branch 'venv' into dt-test
Merge branch 'conf-tempest' into dt-test
Merge branch 'test-service-functions' into dt-test
Merge branch 'exercise-refresh' into dt-test