Switch all grenade jobs to be non voting and non gating temporary

Until related bug will not be fixed, grenade jobs are failing quite
often. Lets make them non voting to make our life easier.

This can be reverted when related bug will be fixed.

Change-Id: Iefe8d6ab2eea3e04e40cbf4ffaf0c646b51834c4
Related-Bug: #1820892

.zuul.yaml

@@ -56,6 +56,10 @@
             irrelevant-files: *tempest-irrelevant-files
         - grenade-py3:
             irrelevant-files: *tempest-irrelevant-files
+            # TODO(slaweq): switch it again to voting after bug
+            # https://bugs.launchpad.net/devstack/+bug/1820892
+            # will be fixed
+            voting: false
         - openstacksdk-functional-devstack-networking:
             voting: false
     gate:
@@ -72,17 +76,23 @@
         - neutron-tempest-dvr
         - neutron-tempest-linuxbridge
         - neutron-tempest-iptables_hybrid
-        - neutron-grenade-multinode
-        - neutron-grenade-dvr-multinode
-        - neutron-grenade
+        # TODO(slaweq): bring back grenade jobs after bug
+        # https://bugs.launchpad.net/devstack/+bug/1820892
+        # will be fixed
+        #- neutron-grenade-multinode
+        #- neutron-grenade-dvr-multinode
+        #- neutron-grenade
         - tempest-full:
             timeout: 10800
         - tempest-full-py3:
             timeout: 10800
         - tempest-slow-py3:
             irrelevant-files: *tempest-irrelevant-files
-        - grenade-py3:
-            irrelevant-files: *tempest-irrelevant-files
+        # TODO(slaweq): bring back grenade jobs after bug
+        # https://bugs.launchpad.net/devstack/+bug/1820892
+        # will be fixed
+        #- grenade-py3:
+        #    irrelevant-files: *tempest-irrelevant-files
     periodic:
       jobs:
         - neutron-functional
@@ -234,6 +244,10 @@
       - openstack-infra/devstack-gate
       - openstack/neutron
     irrelevant-files: *tempest-irrelevant-files
+    # TODO(slaweq): switch it again to voting after bug
+    # https://bugs.launchpad.net/devstack/+bug/1820892
+    # will be fixed
+    voting: false
 
 - job:
     name: neutron-grenade-dvr-multinode
@@ -246,6 +260,10 @@
       - openstack-infra/devstack-gate
       - openstack/neutron
     irrelevant-files: *tempest-irrelevant-files
+    # TODO(slaweq): switch it again to voting after bug
+    # https://bugs.launchpad.net/devstack/+bug/1820892
+    # will be fixed
+    voting: false
 
 - job:
     name: neutron-tempest-dvr-ha-multinode-full
@@ -390,6 +408,10 @@
       - openstack-infra/devstack-gate
       - openstack/neutron
     irrelevant-files: *tempest-irrelevant-files
+    # TODO(slaweq): switch it again to voting after bug
+    # https://bugs.launchpad.net/devstack/+bug/1820892
+    # will be fixed
+    voting: false
 
 - job:
     name: neutron-tempest-postgres-full