Promoter test: disable tripleo-common tests
Promoter test: disable tripleo-common tests

tripleo-common fails to install in centos7 for python2.7, and it's to
difficult to fix.
We are disabling this test until the job is migrated to centos8

Change-Id: Ib3e7757eaf75d5b21f6aad576fc6dc628493861c

redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,rdo-infra/ci-config,redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config,rdo-infra/ci-config