Remove master only job

legacy-periodic-tempest-dsvm-oslo-latest-full-master
runs only on master, remove it. This needs to stay in project-config.

Change-Id: I81e66ddb0976bb4bb7a7cd8efbbae3bda551191d

Author: ajaeger

.zuul.yaml

@@ -591,10 +591,3 @@
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
-    periodic:
-      jobs:
-        - legacy-periodic-tempest-dsvm-oslo-latest-full-master:
-            irrelevant-files:
-              - ^.*\.rst$
-              - ^doc/.*$
-