boot: qemu: allow host bridge network in docker
To allow qemu devices both inside and outside to operate mosty identically, especially with respect to netdevice configuration, the docker network environment should match the host network environment.
To achieve that tell docker to set the network to host and add the NET_ADMIN capability. On top of that to support the qemu bridge netdevices add the tun device from the host.
Fixes: #548
Signed-off-by: Sjoerd Simons sjoerd@collabora.com