Add non-voting constraints jobs to neutron

Adds python2.7 and 3.4 constraints jobs to neutron in a non-voting fashion.
Voting is set to false for safety of initial insert.

Implements Blueprint: Requirements-Management
Depends-On: I13579599dfdf846d06d8c39f33265e8b46db6e68
Change-Id: I3f4c9e6d468181c7d8999fc12a42df1fe72ff7aa

jenkins/jobs/projects.yaml

@@ -900,6 +900,7 @@
 
     jobs:
       - python-jobs
+      - python-constraints-jobs
       - python-juno-bitrot-jobs
       - python-kilo-bitrot-jobs
       - openstack-publish-jobs

zuul/layout.yaml

@@ -1746,6 +1746,12 @@ jobs:
   - name: ^gate-.*-py(?:thon\d\d|py)-constraints$
     branch: ^(?!stable/(?:juno|kilo)).*$
 
+  - name: gate-neutron-python27-constraints
+    voting: false
+
+  - name: gate-neutron-python34-constraints
+    voting: false
+
   # End Constraints Jobs
 
 # The project list is grouped by type of project, and within each
@@ -2659,7 +2665,9 @@ projects:
       - name: merge-check
       - name: python26-jobs
       - name: python-jobs
+      - name: python-constraints-jobs
       - name: python3-jobs
+      - name: python3-constraints-jobs
       - name: openstack-server-publish-jobs
       - name: openstack-server-release-jobs
       - name: periodic-juno