Mark puppet-lint jobs as voting

Since the introduction of non-voting puppet-lint jobs for OpenStack
puppet modules, a lot of cleanup have been done in the manifests.

All puppet-lint ERRORS have been fixed and builds are now passing
successfully. We wish to enable voting for puppet-lint jobs.

We are aware that WARNINGS are still present but won't fail the build.
Fixing WARNINGS will be a work in progress in the following months.

Change-Id: I155154b7a3fe2c18130bdcb6b76be11f57c0a0ed

modules/openstack_project/files/zuul/layout.yaml

@@ -176,8 +176,6 @@ jobs:
     voting: false
   - name: gate-savanna-dashboard-requirements
     voting: false
-  - name: ^gate-puppet-.*-puppet-lint$
-    voting: false
   - name: gate-django_openstack_auth-pep8
     voting: false
   - name: gate-django_openstack_auth-docs