Consume horizon in-tree django variant jobs

The legacy jobs legacy-horizon-tox-py27dj1* needs to be clean up,
so it is not a good idea to consume them in horizon plugin jobs.
It prevents from pushing them away.
This commit tries to py27dj1* zuulv3 jobs defined in the horizon repo.

Needed-By: I23a95b36e73bb444f94683c801eda11fb1430aa8
Change-Id: I040b35a4830423dce6fa4279882a01b8e88ad5f9

.zuul.yaml

@@ -2,7 +2,7 @@
     name: openstack/heat-dashboard
     check:
       jobs:
-        - legacy-horizon-tox-py27dj18:
+        - horizon-openstack-tox-py27dj18:
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -10,7 +10,7 @@
               - ^releasenotes/.*$
             required-projects:
               - openstack/horizon
-        - legacy-horizon-tox-py27dj19:
+        - horizon-openstack-tox-py27dj19:
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -18,7 +18,7 @@
               - ^releasenotes/.*$
             required-projects:
               - openstack/horizon
-        - legacy-horizon-tox-py27dj110:
+        - horizon-openstack-tox-py27dj110:
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -29,7 +29,7 @@
     gate:
       queue: heat-dashboard
       jobs:
-        - legacy-horizon-tox-py27dj18:
+        - horizon-openstack-tox-py27dj18:
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -37,7 +37,7 @@
               - ^releasenotes/.*$
             required-projects:
               - openstack/horizon
-        - legacy-horizon-tox-py27dj19:
+        - horizon-openstack-tox-py27dj19:
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -45,7 +45,7 @@
               - ^releasenotes/.*$
             required-projects:
               - openstack/horizon
-        - legacy-horizon-tox-py27dj110:
+        - horizon-openstack-tox-py27dj110:
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$