Keep barbican integration job running on Bionic
Keep barbican integration job running on Bionic

keeping os-brick-src-tempest-lvm-lio-barbican job running on bionic nodeset till
https://storyboard.openstack.org/#!/story/2007732 is fixed
otherwise base devstack jobs switching to Focal will block
the gate.

Change-Id: I482ac98bc56f0e3cfb8b767f47649da11ed1afab
Story: #2007865
Task: #40179

openstack/os-brick,openstack/os-brick