zuul: Mark live migration jobs as non-voting due to bug #1912310

Bug #1912310 details an underlying QEMU live migration failure seen
during both volume backend and block migration based live migration
tests in the nova-live-migration job. The failure rate is getting high
enough now that we should mark these jobs as non-voting until it is
resolved.

Change-Id: Ifc211fadb3ca9c7c0a74d7dcd225bdb3f3008d26
Related-Bug: #1912310

.zuul.yaml

@@ -120,6 +120,9 @@
               # NOTE(lyarwood): Skip until bug #1931702 is resolved.
               block_migrate_cinder_iscsi: false
     post-run: playbooks/nova-live-migration/post-run.yaml
+    # NOTE(lyarwood): This job is now non-voting until bug #1912310 is resolved
+    # within libvirt/QEMU.
+    voting: false
 
 - job:
     name: nova-live-migration-ceph
@@ -139,6 +142,9 @@
               block_migration_for_live_migration: false
               block_migrate_cinder_iscsi: false
     post-run: playbooks/nova-live-migration/post-run.yaml
+    # NOTE(lyarwood): This job is now non-voting until bug #1912310 is resolved
+    # within libvirt/QEMU.
+    voting: false
 
 - job:
     name: nova-lvm