Nate Johnston ca8026b5c1 Catch only MessageDeliveryFailure exceptions
There was a todo left to only catch MessageDeliveryFailure exceptions
once they were being propagated properly; the bug related to that [1]
has been closed and the fix is merged [2].  So we can catch only the
correct error and eliminate the TODO.

TrivialFix

[1] https://bugs.launchpad.net/neutron/+bug/1705351
[2] https://review.openstack.org/486706

Change-Id: I1201ee150709b84e6f4b2fa4b108da9ea28983a3
2019-02-21 15:31:14 -05:00
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