Add firewall traffic on port 27410

The seed VM will attempt to send a Heat signal to a mocked Heat service
on the Jenkins slave where devtest_*.sh runs.

Open up port 27410 to accept that incoming traffic.

Required for: Ibfd20bf632cdf3381615dad68ecf620685553d5f
Alternative-to: I9e85f34339d7943a3a37a3b6772b9eb8ac85bf6c
Alternative-to: Idf1ca79ed653f2a62ee853b16f7c3fe14b7667cd

Change-Id: Ib52efa0f3f7c26d00fee7c14ffad6a812766dd0d
Merge "Add firewall traffic on port 27410"