Optimize the check pipeline runtime

devstack-tempest and devstack-tempest-ipv6 jobs
are base jobs and other Tempest job like tempest-full-py3
or Tempest-ipv6-only are derived from those base job so running
tempest jobs are enough.

We do not need to run base jobs as such.

Change-Id: I2526b3bd5dc0d9a46ed15cefd941a3bbd55e6a49
1 file changed