Open ports 8003, 8004 for heat API calls from compute

The tempest autoscaling scenario needs to push cloudwatch stats to
port 8003. Also there will soon be tempest tests which call the
native Heat API on port 8004 so this too needs to be open.

Change-Id: Ie0f0822d0a9cca08b7c0c09c8c2b130a417553fb
Merge "Open ports 8003, 8004 for heat API calls from compute"