[Rdo-list] Proposed workaround for rabbitmq problem in new F20 VM

[Ben Nemec]

Hi,

I pushed a proposed workaround for the rabbitmq problem running devstack on Fedora 20.  Ideally it would be best to fix the problem with rabbitmq, but in the meantime this change shouldn't hurt anything when rabbit behaves and it made devstack complete successfully again for me on the first try.

https://review.openstack.org/#/c/70156/

Let me know if you have any feedback.  Thanks.

-Ben