Add a simple version of Mistral HA gate

The idea of the new gate is to run tests on multi-node Mistral w/o
Devstack and Tempest at all. For now the gate configuration is
very primitive and just calls two scripts from the mistral repo
so that we could debug more easily by sending patchsets to Mistral
with changes made against these scripts. Once they work it'll be
better to create a builder within the Jenkins Mistral configuration.

Change-Id: I898e125d37a31a00e972be5962a49af2a6076acd

jenkins/jobs/mistral.yaml

@@ -52,6 +52,33 @@
       - console-log
 
 
+- job-template:
+    name: '{pipeline}-mistral-ha-{node}{suffix}'
+    node: '{node}'
+
+    wrappers:
+      - build-timeout:
+          timeout: 70
+      - timestamps
+
+    builders:
+      - link-logs
+      - net-info
+      - zuul-git-prep
+      - install-distro-packages
+      - shell: |
+          # TODO: this is a temporary solution that puts all installation
+          # code into a script residing in mistral repo just for more
+          # convenient debugging (since we'll be able to send patchsets to
+          # mistral with "check experimental" and trigger the gate). After
+          # it's ready it'll be better to create a special builder in this
+          # file.
+          ha_gate/install.sh
+          ha_gate/run_tests.sh
+    publishers:
+      - console-log
+
+
 - job:
     name: gate-mistral-docker-buildimage
     node: ubuntu-xenial

jenkins/jobs/projects.yaml

@@ -6901,6 +6901,10 @@
           component: mistral
           suffix: '-nv'
           special: '-kombu'
+      - '{pipeline}-mistral-ha-{node}{suffix}':
+          pipeline: gate
+          node: ubuntu-xenial
+          suffix: '-nv'
       - gate-rally-dsvm-mistral-{name}-{node}{suffix}:
           name: task
           node: ubuntu-xenial

zuul/layout.yaml

@@ -11369,6 +11369,7 @@ projects:
       - gate-mistral-docker-buildimage
     experimental:
       - gate-mistral-docker-buildimage
+      - gate-mistral-ha-ubuntu-xenial-nv
 
   - name: openstack/mistral-dashboard
     template: