switch to xenial

Author: Anthony Roberts

ci/pipeline.yml

@@ -70,7 +70,7 @@ resources:
     bucket: ((buildtools-release-tarballs.bucket))
     json_key: ((prod-build-storage-google-key))
     regexp: nexus-boshrelease/nexus-boshrelease-v(.*).tgz
-- name: warden-stemcell
+- name: warden-stemcell-xenial
   type: bosh-io-stemcell
   source:
     name: bosh-warden-boshlite-ubuntu-xenial-go_agent
@@ -183,7 +183,7 @@ jobs:
       passed:
       - create-dev-release
       trigger: true
-    - get: warden-stemcell
+    - get: warden-stemcell-xenial
       trigger: true
   - task: bbl-up
     file: cf-deployment-concourse-tasks/bbl-up/task.yml
@@ -215,7 +215,7 @@ jobs:
       releases:
       - nexus-boshrelease-tarball/dev-release.tgz
       stemcells:
-      - warden-stemcell/stemcell.tgz
+      - warden-stemcell-xenial/stemcell.tgz
       vars:
         deployment_name: *deployment-name
   - task: test-nexus