Disable stable/rocky temporarily on Tempest master

Stable/rocky jobs are broken due to py2
drop by Tempest dependency.
- http://lists.openstack.org/pipermail/openstack-discuss/2020-February/012371.html

Fixes are on devstack stable/rocky and tempest side
- https://review.opendev.org/#/q/topic:fix-stable-gate+(status:open+OR+status:merged)

To get the Tempest fix and other patches merged
we need to disable the rocky jobs on master gate
temporary and bring them back once everything is fixed.

Tempest fix blocked due to stable/rocky jobs
-https://review.opendev.org/#/c/705870/

Change-Id: I2238387c42650aceb9bacf51a4116ce6887cc460
1 file changed