Block stable/feature branch for new project imports
Block stable/feature branch for new project imports

When importing projects, check that they do not contain a simple
"stable" branch as that will block creation of "stable/RELEASE" branches
like "stable/mitaka".
Similar for "feature".

Change-Id: Ia190fdbddf9029149b54e686aa0e82fe040b6733

Tesora/tesora-project-config,dongwenjuan/project-config,dongwenjuan/project-config,openstack-infra/project-config,openstack-infra/project-config,Tesora/tesora-project-config