Update zuul neutron template to yoga template

Updated the zuul neutron template to latest yoga template.

Change-Id: Icb4d6d08d70af1147bba5bb0fbe8804b2e0f540b

Author: abdallahyas

.zuul.yaml

@@ -1,3 +1,3 @@
 - project:
     templates:
-        - openstack-python3-xena-jobs-neutron
+        - openstack-python3-yoga-jobs-neutron