These teams are PTL-less and not necessary define their
release liaison in openstack/release/data/release_liaison.yaml.
The problem is that their release liaison approval is not
necessarily detected.
These changes allow to consider these release liaisons folks.
Furthermore, patch Id0d6eeaf66394806374781d1cf26c087a6e90f87,
from the similar script in project-config repository, also applied
here in this script to avoid exception in case of DPL teams.
Change-Id: Ieaf1eafc6a8e3ce443d73876e525f738e51dea67
3dfdc3e59b