Add tripleo standalone template

After discoveries we found at
https://bugs.launchpad.net/tripleo/+bug/1797035 looks like running
standalone at puppe-* gates is worth it, maybe even replacing undercloud
one.

Related-Bug: #1797035

Change-Id: I53a0506d6a5594c6878e569821ecf09562be0dd4

.zuul.yaml

@@ -706,6 +706,32 @@
       jobs:
         - tripleo-puppet-ci-centos-7-undercloud-containers
 
+- job:
+    name: tripleo-puppet-ci-centos-7-standalone
+    parent: tripleo-ci-centos-7-standalone
+    branches: ^(?!stable/(newton|ocata|pike|queens)).*$
+    irrelevant-files:
+      - ^.*\.md$
+      - ^.*\.rst$
+      - ^doc/.*$
+      - ^etc/.*$
+      - ^metadata.json$
+      - ^releasenotes/.*$
+      - ^test-requirements.txt$
+      - ^LICENSE$
+      - ^.gitignore$
+
+- project-template:
+    name: tripleo-puppet-standalone
+    check:
+      jobs:
+        - tripleo-puppet-ci-centos-7-standalone
+    gate:
+      jobs:
+        - tripleo-puppet-ci-centos-7-standalone
+
+
+
 
 - project-template:
     name: puppet-openstack-library-jobs