Enable py35 voting on oslotest

The py35 job runs without error on the project oslotest, therefore
we can safely enabling voting. Reference patch:
https://review.openstack.org/340791

Change-Id: Ie90b31ef222c508b666a8b6aaa03343a84d2a6a0

jenkins/jobs/projects.yaml

@@ -6206,7 +6206,7 @@
       - python-jobs
       - 'gate-{name}-pypy'
       - 'gate-{name}-python35{suffix}':
-          suffix: '-nv'
+          suffix: ''
       - openstack-publish-jobs
       - pypi-jobs
 

zuul/layout.yaml

@@ -9951,7 +9951,7 @@ projects:
       - name: merge-check
       - name: python-jobs
       - name: python34-jobs
-      - name: python35-jobs-nv
+      - name: python35-jobs
       - name: pypy-jobs
       - name: openstack-server-publish-jobs
       - name: check-requirements