Optimize the check pipeline runtime

devstack-tempest and devstack-tempest-ipv6 jobs
are base jobs and other Tempest job like tempest-full-py3
or Tempest-ipv6-only are derived from those base job so running
tempest jobs are enough.

We do not need to run base jobs as such.

Change-Id: I2526b3bd5dc0d9a46ed15cefd941a3bbd55e6a49
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index 5dcd27f..d5b2787 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -8,17 +8,6 @@
       - release-notes-jobs-python3
     check:
       jobs:
-        - devstack-tempest:
-            files:
-              - ^playbooks/
-              - ^roles/
-              - ^.zuul.yaml$
-        - devstack-tempest-ipv6:
-            voting: false
-            files:
-              - ^playbooks/
-              - ^roles/
-              - ^.zuul.yaml$
         - tempest-full-parallel:
             # Define list of irrelevant files to use everywhere else
             irrelevant-files: &tempest-irrelevant-files