Log Message:
Update ruby-amqp to 1.7.0.

Changes Between 1.6.0 and 1.7.0 (Feb 2nd, 2017)

* Clear Framesets on Exception

  Unprocessed frames received on a connection are now correctly
  cleared when an exception occurs.

  Contributed by Michael Lutsiuk.

  GitHub issue: #218

* amq-protocol Update

  Minimum amq-protocol version is now 2.1.0.