Add stable branch jobs on the plugins master gate

Supported stable branches in maintenance state
(stein, train, ussuri) use the Tempest and plugins master
version for their testing. To make sure master version (new
tests or any changes) is compatible with stable branch testing,
we need to add the stable branches job on the plugins master gate.
Tempest and many other plugins are already testing the stable
branches in same way[1].

Ussuri onwards, Tempest or plugins are py3 only, so we are
running only python3 version of stable jobs

Tempest plugins guide for stable branch testing:
- https://docs.openstack.org/tempest/latest/stable_branch_testing_policy.html

[1] https://opendev.org/openstack/tempest/src/commit/e8f1876aa6772077f85f380677b30251c2454505/.zuul.yaml#L646

Depends-On: https://review.opendev.org/#/c/727848/

Change-Id: Ic2d79795fa205525dc5adaaae342e0c6f29d28d9
diff --git a/.zuul.yaml b/.zuul.yaml
index 1068175..9f734ae 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -7,6 +7,9 @@
         - cinder-tempest-plugin-lvm-lio-barbican
         - cinder-tempest-plugin-lvm-tgt-barbican
         - cinder-tempest-plugin-cbak-ceph
+        - cinder-tempest-plugin-basic-ussuri
+        - cinder-tempest-plugin-basic-train
+        - cinder-tempest-plugin-basic-stein
     gate:
       jobs:
         - cinder-tempest-plugin-lvm-lio-barbican
@@ -100,3 +103,44 @@
       This jobs configures Cinder with LVM, tgt, barbican and
       runs tempest tests and cinderlib tests.
     parent: cinder-tempest-plugin-lvm-barbican-base
+
+- job:
+    name: cinder-tempest-plugin-basic
+    parent: devstack-tempest
+    description: |
+      Cinder tempest plugin tests job which run only cinder-tempest-plugin
+      tests.
+    required-projects:
+      - opendev.org/openstack/cinder-tempest-plugin
+    vars:
+      devstack_localrc:
+        TEMPEST_VOLUME_REVERT_TO_SNAPSHOT: True
+      tox_envlist: all
+      tempest_test_regex: cinder_tempest_plugin
+      tempest_plugins:
+        - cinder-tempest-plugin
+    irrelevant-files:
+      - ^.*\.rst$
+      - ^doc/.*$
+      - ^releasenotes/.*$
+
+- job:
+    name: cinder-tempest-plugin-basic-ussuri
+    parent: cinder-tempest-plugin-basic
+    override-checkout: stable/ussuri
+
+- job:
+    name: cinder-tempest-plugin-basic-train
+    parent: cinder-tempest-plugin-basic
+    override-checkout: stable/train
+    vars:
+      devstack_localrc:
+        USE_PYTHON3: True
+
+- job:
+    name: cinder-tempest-plugin-basic-stein
+    parent: cinder-tempest-plugin-basic
+    override-checkout: stable/stein
+    vars:
+      devstack_localrc:
+        USE_PYTHON3: True