Add Tempest gate job for stable/zed

Now we have stable/zed branch ready for devstack and so does
for all service projects.

This commit adds the Tempest testing for stable/zed by adding
new jobs running on stable/zed version of openstack.

Change-Id: I6a331a6f2466aa4e4d9f607660b87fa60a63bf4b

zuul.d/project.yaml

@@ -34,6 +34,8 @@
         - glance-multistore-cinder-import:
             voting: false
             irrelevant-files: *tempest-irrelevant-files
+        - tempest-full-zed:
+            irrelevant-files: *tempest-irrelevant-files
         - tempest-full-yoga:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-xena:
@@ -168,9 +170,11 @@
             irrelevant-files: *tempest-irrelevant-files
     periodic-stable:
       jobs:
+        - tempest-full-zed
         - tempest-full-yoga
         - tempest-full-xena
         - tempest-full-wallaby-py3
+        - tempest-slow-zed
         - tempest-slow-yoga
         - tempest-slow-xena
         - tempest-slow-wallaby

zuul.d/stable-jobs.yaml

@@ -1,4 +1,9 @@
 # NOTE(gmann): This file includes all stable release jobs definition.
+- job:
+    name: tempest-full-zed
+    parent: tempest-full-py3
+    override-checkout: stable/zed
+
 - job:
     name: tempest-full-yoga
     parent: tempest-full-py3
@@ -14,6 +19,11 @@
     parent: tempest-full-py3
     override-checkout: stable/wallaby
 
+- job:
+    name: tempest-slow-zed
+    parent: tempest-slow-py3
+    override-checkout: stable/zed
+
 - job:
     name: tempest-slow-yoga
     parent: tempest-slow-py3