Verify that a flooded connection closes correctly #176
Description
When tx5 receives more messages from the app or from the network than it can handle, it kills the channel that relays messages between the network and the application. Write tests to verify that the channel closing results in the connection shutting down.
See the warning added to notify us if this happens: https://github.com/holochain/tx5/pull/175/files#diff-bb2fb84dc37b8786cdcab5aae7d5da7438d441ae3ffaceb7bdc6f0a568cf6668R98