This add a aditional test in the tempest_test_includelist. This is
required right now as a workaround for tripleo jobs, while the
implementation of the includelist in openstack-tempest-skiplist tool.
Tripleo uses os_tempest to setup and run tempest, but it doesn't run all
tempest tests. Sometimes, the list of excluded tests matches the list of
included tests and so tempest fail with no tests to run. This
tempest_test_extra_test will ensure that it will execute at least one
keystone api test to avoid this.
Right now, the tempest_test_whitelist variable is parsed to ansible via
-e command line, and so it's hard to overwrite it on tripleo side, and
it's spreaded in several different jobs with several different set of
tests. So, this is the best/easy way to fix this problem, while we work
on a long term solution.
Change-Id: Ic5f5b44d81ed39b1fa622b5a1d76e482c2aa23aa
4c0fcc91c3