Move nova-cells-v1 job to the experimental queue

Nova is moving the nova-cells-v1 job to its experimental
queue so we should do the same in Tempest.

Depends-On: https://review.openstack.org/623538

Change-Id: I277f3a4bea69501ea4c07118c552343d5ea38f6a
Related-Bug: #1807407
diff --git a/.zuul.yaml b/.zuul.yaml
index 9af79a6..dc5dea1 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -522,8 +522,6 @@
               # tools/ is not here since this relies on a script in tools/.
         - tempest-slow:
             irrelevant-files: *tempest-irrelevant-files
-        - nova-cells-v1:
-            irrelevant-files: *tempest-irrelevant-files
         - nova-live-migration:
             voting: false
             irrelevant-files: *tempest-irrelevant-files
@@ -583,6 +581,8 @@
             irrelevant-files: *tempest-irrelevant-files
         - neutron-tempest-dvr-ha-multinode-full:
             irrelevant-files: *tempest-irrelevant-files
+        - nova-cells-v1:
+            irrelevant-files: *tempest-irrelevant-files
         - legacy-tempest-dsvm-nova-v20-api:
             irrelevant-files: *tempest-irrelevant-files
         - legacy-tempest-dsvm-lvm-multibackend: