Enable py35 voting on taskflow

The py35 job runs without error on the project taskflow,
therefore we can safely enabling voting. Reference patch:
https://review.openstack.org/340818

Change-Id: Ie274ceee9b2c71cfd28e6feff5f66d257d173667

jenkins/jobs/projects.yaml

@@ -10380,7 +10380,7 @@
       - coverage-db-jobs
       - python-db-jobs
       - 'gate-{name}-python35-db{suffix}':
-          suffix: '-nv'
+          suffix: ''
       - openstack-publish-jobs
       - pypi-jobs
       - 'lib-forward-testing-{name}'

zuul/layout.yaml

@@ -12701,7 +12701,7 @@ projects:
       - name: check-requirements
       - name: python-db-jobs
       - name: python34-db-jobs
-      - name: python35-db-jobs-nv
+      - name: python35-db-jobs
       - name: pypy-db-jobs
       - name: openstack-server-publish-jobs
       - name: publish-to-pypi