Fix Barbican tempest plugin issue
The same problem like with Octavia
export OVERRIDE_ZUUL_BRANCH=$BRANCH_OVERRIDE
fi
export PROJECTS="openstack/barbican $PROJECTS"
+ export PROJECTS="openstack/barbican-tempest-plugin $PROJECTS"
export PROJECTS="openstack/python-barbicanclient $PROJECTS"
export PROJECTS="openstack/diskimage-builder $PROJECTS"
export PROJECTS="openstack/tripleo-image-elements $PROJECTS"
