Tempest Gate Fix
Tempest Gate Fix

 Removed the last line of 'unset DEVSTACK_PATH' since it looks like
 it messed Jenkins call regarding the success of the job. The above will
 always return return-code 0 meaning success and this hides the tempest
 run return-code of 1 if some test fails

Change-Id: If4591c9e0c70bfc73cf8024cf9da84b58e1f09a9

openstack/vitrage,openstack/vitrage,openstack/vitrage