Add cinder v2 experimental job

Volume tests is now changed to run against v3 APIs
and all current jobs are testing v3 APIs.
- https://review.openstack.org/#/c/527889/7

Cinder v2 is deprecated and it is redirect to v3 base on
cinder that so to cover v2 testing also, this commit is
adding a new job which will:
- run only cinder API test
- Run as experimental job in Tempest(this patch) and cinder(next patch)
- Keep this testing till there is no v2 exist in all supported stable branch

Depends-On: https://review.openstack.org/#/c/527910/

Change-Id: I6bdc6cacba3cec48fcc4d32886a4acf63394b533
diff --git a/.zuul.yaml b/.zuul.yaml
index 8dcb935..75507d7 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -199,6 +199,19 @@
       - openstack/zaqar-tempest-plugin
       - openstack/zun-tempest-plugin
 
+- job:
+    name: tempest-cinder-v2-api
+    parent: devstack-tempest
+    branches:
+      - master
+    description: |
+      This job runs the cinder API test against v2 endpoint.
+    vars:
+      tox_envlist: all
+      tempest_test_regex: api.*volume
+      devstack_localrc:
+        TEMPEST_VOLUME_TYPE: volumev2
+
 - project:
     check:
       jobs:
@@ -284,6 +297,16 @@
               - ^setup.cfg$
               - ^tempest/hacking/.*$
               - ^tempest/tests/.*$
+        - tempest-cinder-v2-api:
+            irrelevant-files:
+              - ^(test-|)requirements.txt$
+              - ^.*\.rst$
+              - ^doc/.*$
+              - ^etc/.*$
+              - ^releasenotes/.*$
+              - ^setup.cfg$
+              - ^tempest/hacking/.*$
+              - ^tempest/tests/.*$
     periodic-stable:
       jobs:
         - tempest-full-queens