Break out py27 job templates

To allow non-py27 supporting repos to use shade job templates, this
breaks out the py27 and py3 jobs into separate templates. Relevant repos
can then continue to use the existing template names without picking up
the unsupported job runtimes they no longer need.

Change-Id: Ia211e31723ede592f19a8df6c18e45699ca25788
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

.zuul.yaml

@@ -31,14 +31,19 @@
       - openstack/os-client-config
 
 - project-template:
-    name: shade-tox-tips
+    name: shade-tox-tips-py27
     check:
       jobs:
         - shade-tox-py27-tips
-        - shade-tox-py35-tips
     gate:
       jobs:
         - shade-tox-py27-tips
+    name: shade-tox-tips
+    check:
+      jobs:
+        - shade-tox-py35-tips
+    gate:
+      jobs:
         - shade-tox-py35-tips
 
 - job:
@@ -204,14 +209,19 @@
       tox_install_siblings: true
 
 - project-template:
-    name: shade-functional-tips
+    name: shade-functional-tips-py27
     check:
       jobs:
         - shade-functional-devstack-tips
-        - shade-functional-devstack-tips-python3
     gate:
       jobs:
         - shade-functional-devstack-tips
+    name: shade-functional-tips
+    check:
+      jobs:
+        - shade-functional-devstack-tips-python3
+    gate:
+      jobs:
         - shade-functional-devstack-tips-python3
 
 - project: