Commented out pip installs tempest-additional-requirements.txt
Commented out pip installs tempest-additional-requirements.txt

Because the TC wants all tests in tempest
(https://governance.openstack.org/resolutions/20160504-defcore-test-location.html)
and since we have nothing in the tempest-additional-requirements.txt. This line always
return errors and confuses the user.

Change-Id: I6c379ced9fc01021254c5bdc363dd9a0697b3e02

stackforge/refstack-client,stackforge/refstack-client,openstack/refstack-client,openstack/refstack-client