When provisioning a VM with a bridge and sriov passthrough, the nic iteration may compare nil to nil resulting in random mac address being associated with the interface and boot/discovery not working as expected.

Nov 19 14:26:32 provisioning foreman[22162]: Comparing networks --   <Fog::Libvirt::Compute::Nic
Nov 19 14:26:32 provisioning foreman[22162]: mac="52:54:00:f8:65:09",
Nov 19 14:26:32 provisioning foreman[22162]: id=nil,
Nov 19 14:26:32 provisioning foreman[22162]: type="bridge",
Nov 19 14:26:32 provisioning foreman[22162]: network=nil,
Nov 19 14:26:32 provisioning foreman[22162]: bridge="br-vm-mgmt",
Nov 19 14:26:32 provisioning foreman[22162]: model="virtio" 
Nov 19 14:26:32 provisioning foreman[22162]: > to {"type"=>"bridge", "bridge"=>"br-vm-mgmt", "model"=>"virtio"}
Nov 19 14:26:32 provisioning foreman[22162]: Comparing networks --  to
Nov 19 14:26:32 provisioning foreman[22162]: Found

Nov 19 14:26:32 provisioning foreman[22162]: Comparing networks --   <Fog::Libvirt::Compute::Nic
Nov 19 14:26:32 provisioning foreman[22162]: mac="52:54:00:cd:74:06",
Nov 19 14:26:32 provisioning foreman[22162]: id=nil,
Nov 19 14:26:32 provisioning foreman[22162]: type="network",
Nov 19 14:26:32 provisioning foreman[22162]: network="passthrough-p3p2",
Nov 19 14:26:32 provisioning foreman[22162]: bridge=nil,
Nov 19 14:26:32 provisioning foreman[22162]: model="virtio" 
Nov 19 14:26:32 provisioning foreman[22162]: > to {"type"=>"network", "network"=>"passthrough-p3p2", "bridge"=>"br-vm-mgmt", "model"=>"virtio"}
Nov 19 14:26:32 provisioning foreman[22162]: Comparing networks -- passthrough-p3p2 to passthrough-p3p2
Nov 19 14:26:32 provisioning foreman[22162]: Found

Nov 19 14:26:32 provisioning foreman[22162]: Comparing networks --   <Fog::Libvirt::Compute::Nic
Nov 19 14:26:32 provisioning foreman[22162]: mac="52:54:00:45:28:cf",
Nov 19 14:26:32 provisioning foreman[22162]: id=nil,
Nov 19 14:26:32 provisioning foreman[22162]: type="network",
Nov 19 14:26:32 provisioning foreman[22162]: network="passthrough-p3p2",
Nov 19 14:26:32 provisioning foreman[22162]: bridge=nil,
Nov 19 14:26:32 provisioning foreman[22162]: model="virtio" 
Nov 19 14:26:32 provisioning foreman[22162]: > to {"type"=>"network", "network"=>"passthrough-p3p2", "bridge"=>"br-vm-mgmt", "model"=>"virtio"}
Nov 19 14:26:32 provisioning foreman[22162]: Comparing networks -- passthrough-p3p2 to passthrough-p3p2
Nov 19 14:26:32 provisioning foreman[22162]: Found