Allow the host to configure a static IP address for eth0 by setting the
following DB keys:
- net/config: "static" (default or not set -> dhcp)
- net/address: IP address
- net/netmask: netmask in dot notation
- net/gateway: default gateway
Also allow overwriting/setting "/etc/resolve.conf" by writing to
the "etc/resolv.conf" key.
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>