Switch to xenial: python-openstackclient

Switch master and newton jobs to run on xenial, older branches test on
trusty.

Change-Id: I37eb7a9d6d2a1d10a089a78158fbf65636156585

jenkins/jobs/osc.yaml

@@ -1,5 +1,5 @@
 - job-template:
-    name: '{pipeline}-osc-dsvm-functional{job-suffix}'
+    name: '{pipeline}-osc-dsvm-functional-{node}{job-suffix}'
     node: '{node}'
 
     wrappers:

jenkins/jobs/projects.yaml

@@ -13167,9 +13167,11 @@
       - 'gate-{name}-python35{suffix}':
           suffix: '-nv'
       - translation-jobs
-      - '{pipeline}-osc-dsvm-functional{job-suffix}':
+      - '{pipeline}-osc-dsvm-functional-{node}{job-suffix}':
           pipeline: gate
-          node: ubuntu-trusty
+          node:
+            - ubuntu-trusty
+            - ubuntu-xenial
           job-suffix: ''
           branch-override: default
       - openstack-client-publish-jobs

zuul/layout.yaml

@@ -15731,10 +15731,12 @@ projects:
       - name: lib-forward-testing
       - name: osc-plugin-jobs
     check:
-      - gate-osc-dsvm-functional
+      - gate-osc-dsvm-functional-ubuntu-trusty
+      - gate-osc-dsvm-functional-ubuntu-xenial
       - gate-tripleo-ci-centos-7-nonha-multinode-nv
     gate:
-      - gate-osc-dsvm-functional
+      - gate-osc-dsvm-functional-ubuntu-trusty
+      - gate-osc-dsvm-functional-ubuntu-xenial
     post:
       - python-openstackclient-coverage-ubuntu-trusty
       - python-openstackclient-coverage-ubuntu-xenial