Upgrade python-amqp to 1.4.6

We need to upgrade this so that kombu 3.0.24 can rely on it. I did a scratch build on koji with the new version, and all platforms built successfully.

https://koji.katello.org/koji/taskinfo?taskID=196665
https://koji.katello.org/koji/taskinfo?taskID=196664
https://koji.katello.org/koji/taskinfo?taskID=196663
https://koji.katello.org/koji/taskinfo?taskID=196662