Components not killed when rabbit just closes transport.

[TarasLevelUp]

Seems like rabbitmq gracefully closes transport when going on shutdown without sending a ConnectionClose. Tested on standalone rabbitmq server 3.5.4. This means, that changes introduced in #54 are not exactly correct (my mistake, sorry). We will need to add some changes to monitor all cases:

• Server closes with ConnectionClose and closes transport gracefully
• Server closes transport gracefully without sending anything
• Server closes transport after ConnectionCloseOK reply
• Server closes transport without ConnectionCloseOK reply
• Socket is broken with an error without any closing procedure in process.

[TarasLevelUp]

I think I can make a patch for this on the weekend. Will probably create a separate tests file purely for those cases.