Install bridge-utils on compute nodes

With nova now handling our port filtering
I3bbcfc67036ab7389c82720add0bc0fc627bfee0
we need to have brctl available on the compute nodes, ubuntu has this
already installed but fedora didn't (causing instances on the
overcloud to fail booting).

Change-Id: Ic2e30d18ec2d33de40b11db07503bb08f0d682a8
Merge "Install bridge-utils on compute nodes"