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
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index 3cc3fda..1432180 100644
--- a/zuul.d/project.yaml
+++ b/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