[lxc-users] unprivileged gentoo containers have no network connection

[overlay fs]

If one uses the gentoo template to create a container,

  $ sudo lxc-create -t gentoo  -f config -n gentoo_test
  $ cat config
    lxc.network.type = veth
    lxc.network.link = lxcbr0
    lxc.network.flags = up

then the gentoo template configures the network connection in the
container's root filesystem.

But if instead one uses the download template to create an
unprivileged gentoo container,

  $ lxc-create -t download -f config -n gentoo_test  -- -d gentoo -r
current -a amd64

then the container does not have an operational network connection.
The network must be configured manually by executing the following
commands in the container:

  $ cd /etc/init.d
  $ ln -s net.lo net.eth0
  $ rc-update add eth0 default

Would it be possible to remedy this, perhaps by either of the following:
  (1) alter the downloadable gentoo image.
  (2) run a post-install script which contains the network portion of
/usr/share/lxc/templates/lxc-gentoo .