Add tempest + postgres job for manila

Right now Manila project is tested in CI only against MySQL DB backend.

Add new tempest job, similar to existing one, but with different
DB backend - PostgreSQL. Set it as non-voting until it becomes stable.

Change-Id: I56cbdd8173bcbc906772457bdcbbebc27c742cfe

jenkins/jobs/manila.yaml

@@ -1,3 +1,49 @@
+- job:
+    name: gate-manila-tempest-dsvm-neutron-postgres
+    node: 'devstack-precise || devstack-trusty'
+
+    wrappers:
+      - build-timeout:
+          timeout: 65
+      - timestamps
+
+    builders:
+      - link-logs
+      - net-info
+      - devstack-checkout
+      - shell: |
+          #!/bin/bash -xe
+          export PYTHONUNBUFFERED=true
+          export DEVSTACK_GATE_TIMEOUT=60
+          export DEVSTACK_GATE_NEUTRON=1
+          export DEVSTACK_GATE_POSTGRES=1
+          export ENABLED_SERVICES=tempest
+          # Enable manila devstack plugin. Provided repo should be cloned by zuul before devstack run
+          # and below provided link should not be used.
+          export DEVSTACK_LOCAL_CONFIG="enable_plugin manila git://git.openstack.org/openstack/manila"
+
+          # Keep localrc to be able to set some vars in pre_test_hook
+          export KEEP_LOCALRC=1
+
+          function pre_test_hook {
+              source $BASE/new/manila/contrib/ci/pre_test_hook.sh
+          }
+          export -f pre_test_hook
+
+          function post_test_hook {
+              # Configure and run tempest on singlebackend manila installation
+              source $BASE/new/manila/contrib/ci/post_test_hook.sh singlebackend
+          }
+          export -f post_test_hook
+
+          cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh
+          ./safe-devstack-vm-gate-wrap.sh
+
+    publishers:
+      - devstack-logs
+      - console-log
+
+
 - job:
     name: gate-manila-tempest-dsvm-neutron
     node: 'devstack-precise || devstack-trusty'

zuul/layout.yaml

@@ -890,6 +890,8 @@ jobs:
     voting: false
   - name: gate-manila-pylint
     voting: false
+  - name: gate-manila-tempest-dsvm-neutron-postgres
+    voting: false
   - name: gate-manila-tempest-dsvm-neutron-no-share-servers
     voting: false
   - name: gate-manila-tempest-dsvm-neutron-scenario
@@ -1520,6 +1522,7 @@ projects:
       - gate-manila-tempest-dsvm-neutron
       - gate-manila-tempest-dsvm-neutron-multibackend
       - gate-manila-tempest-dsvm-neutron-no-share-servers
+      - gate-manila-tempest-dsvm-neutron-postgres
     gate:
       - gate-manila-tox-genconfig
       - gate-manila-tempest-dsvm-neutron