Turtle doesn't track heartbeat_timeout correctly

[jlouis]

The problem is as follows:

• If a heartbeat_timeout occurs, then the connection_sup of amqp dies.
• Now, this should lead to handling inside turtle_janitor, but the janitor is monitoring the wrong process and will never receive a down message on the connection.
• The system now hangs. The connection manager for the connection thinks the connection is fine.

In addition:

• The janitor ought to cleanup and remove every channel connected up on the connection as well. This is somewhat mind-boggling because all of the channels should be gone by now and destroyed. Yet, internal testing shows that the channels actually persist in the system.
• Only possible conclusion for now: something is not getting cleaned up like it should.

[jlouis]

Fixed already.