Don't use oslo.cfg to set kombu in-memory driver

This removes a TODO and also fixes a issue due to the
global state of oslo.config.cfg.CONF.

Closes bug: #1397339

Change-Id: Ib366f35678f899fda93821e6f07897baf8f631b4
Rabbit: iterconsume must honor timeout

The iterconsume method of the rabbit driver must
honor timeout parameter when reconnection to the broker
occurs.

Change-Id: I666d818449750c6bae9dde02f519842687a8e4fa
Rabbit: Fixes debug message format

Add the missing 's' for the message format and
just print the number queues instead of print a list
full of '<object object at 0xXXXXXXXXXX>'.

Change-Id: Idaab4057bc6a41523a1944ae0c8e15e5e885b390
Merge "Rabbit: Fixes debug message format"