Add heat-agents to tripleo cloned list
Add heat-agents to tripleo cloned list

We need to test TripleO patches with Depends-On to heat-agents
patches so add the repo to the list.

Change-Id: I9f9003352f915b4e27c018fbf6757d5ef9912bbe

openstack-infra/project-config,openstack-infra/project-config