Make octavia-grenade job non-voting

Until some python3 upgrade issues are fixed, disable the job
since it's at 100% failure rate.

Change-Id: I29532d955a1d35ad3703af4c18091d4c536b5ad8

zuul.d/projects.yaml

@@ -37,7 +37,9 @@
             voting: false
         - octavia-v2-dsvm-py2-scenario-two-node:
             voting: false
+        # TODO(haleyb): restore to voting once python3 issues fixed
         - octavia-grenade:
+            voting: false
             irrelevant-files:
               - ^.*\.rst$
               - ^api-ref/.*$
@@ -92,17 +94,6 @@
         - octavia-v2-dsvm-noop-py2-api
         - octavia-v2-dsvm-scenario
         - octavia-v2-dsvm-py2-scenario
-        - octavia-grenade:
-            irrelevant-files:
-              - ^.*\.rst$
-              - ^api-ref/.*$
-              - ^doc/.*$
-              - ^octavia/tests/unit/.*$
-              - ^releasenotes/.*$
-              - ^setup.cfg$
-              - ^tools/.*$
-              - ^(test-|)requirements.txt$
-              - ^tox.ini$
     periodic:
       jobs:
         - publish-openstack-octavia-amphora-image-xenial: