Run cue jobs on Xenial

Part of the transition to Xenial. Cue only has a master branch so just
shift ahead to Xenial.

Change-Id: I7bb74b5e0a54a4eb248489ee702e640c90c098fb

jenkins/jobs/cue.yaml

@@ -1,6 +1,6 @@
 - job-template:
-    name: 'gate-cue-integration-dsvm-{broker}'
+    name: 'gate-cue-integration-dsvm-{broker}-{node}'
-    node: ubuntu-trusty
+    node: '{node}'
 
     wrappers:
       - build-timeout:

jenkins/jobs/projects.yaml

@@ -1661,8 +1661,9 @@
           node:
             - ubuntu-xenial
           job-suffix: '-nv'
-      - 'gate-cue-integration-dsvm-{broker}':
+      - 'gate-cue-integration-dsvm-{broker}-{node}':
           broker: 'rabbitmq'
+          node: ubuntu-xenial
 
 - project:
     name: cue-dashboard

zuul/layout.yaml

@@ -6650,10 +6650,10 @@ projects:
       - name: check-requirements
     check:
       - cue-coverage-ubuntu-xenial
-      - gate-cue-integration-dsvm-rabbitmq
+      - gate-cue-integration-dsvm-rabbitmq-ubuntu-xenial
       - gate-rally-dsvm-cue-rabbitmq-ubuntu-xenial-nv
     gate:
-      - gate-cue-integration-dsvm-rabbitmq
+      - gate-cue-integration-dsvm-rabbitmq-ubuntu-xenial
     pre-release:
       - cue-tarball
     release: