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
diff --git a/.zuul.yaml b/.zuul.yaml
index 8cf5a1e..f749b74 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -649,8 +649,10 @@
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-rocky:
             irrelevant-files: *tempest-irrelevant-files
+            voting: false
         - tempest-full-rocky-py3:
             irrelevant-files: *tempest-irrelevant-files
+            voting: false
         - tempest-multinode-full:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-multinode-full-py3: