Add stestr master job

Tempest use stestr to run the tests, adding
a experimental and periodic job to run Tempest
with stestr master will help to detect any
breaking change in advance.

Change-Id: Ice57e193c5150be7141e0e003be5091a191b854c
diff --git a/zuul.d/tempest-specific.yaml b/zuul.d/tempest-specific.yaml
index fd348cc..5063d89 100644
--- a/zuul.d/tempest-specific.yaml
+++ b/zuul.d/tempest-specific.yaml
@@ -113,3 +113,19 @@
     vars:
       devstack_localrc:
         TEMPEST_HAS_ADMIN: False
+
+- job:
+    name: tempest-stestr-master
+    parent: devstack-tempest
+    description: |
+      Smoke integration test with stestr master.
+      This ensures that new stestr release does
+      not break Temepst.
+    vars:
+      tox_envlist: stestr-master
+      devstack_services:
+        s-account: false
+        s-container: false
+        s-object: false
+        s-proxy: false
+        c-bak: false