Runs the test set defined by RefStack [1]. Creates OpenStack resources
needed for running Tempest tests if required.
Blacklist mechanism for excluding test cases from execution is
supported.
[1] https://refstack.openstack.org/api/v1/guidelines/2019.06/tests?target=platform&type=required&alias=true&flag=false
JIRA: VAL-36
Change-Id: I30e3f3a084e028c7ec75f1254319448ebace72a9
Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>