Add non-voting pylint check to cinder project

Change-Id: I5b9c0b86058610ad34a47afb3714f26a87056813
Reviewed-on: https://review.openstack.org/28805
Reviewed-by: John Griffith <john.griffith@solidfire.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins