- kombu4 wraps recoverable errors as OperationalErrors rather than
raising amqp errors
- also, raise a recoverable error and redeclare if for some reason a
message is double acknowledged... previously, this was hidden.
- ensure socket is not none
- use connect method to ensure connection
Depends-On: I9f980b51901ac31599b9651633956ad2eea6a1ac
Change-Id: I73958c8057353a2eefe1baaa7a41148193d507f7