Comment 2 for bug 1821135

By changing docker0 to br-phy0, VXLAN can be enabled. But this workaround requires: the bridges "br-phyi" on different compute nodes share a same name. For example:
   compute-0 compute-1
    br-phy0 br-phy0 Work
    br-phy0 br-phy1 Don't Work (br-phy0 on compute-1 may not exist or don't have an IP address)