connman-conf: do nothing in qemu, do not touch eth0

qemu kernel itself is nowdays perfectly capable of setting up
what was passed in via ip=:

    [    1.676847] IP-Config: Complete:
    [    1.677768]      device=eth0, hwaddr=52:54:00:12:34:02, ipaddr=192.168.7.2, mask=255.255.255.0, gw=192.168.7.1
    [    1.679933]      host=192.168.7.2, domain=, nis-domain=(none)
    [    1.681201]      bootserver=255.255.255.255, rootserver=255.255.255.255, rootpath=
    [    1.681203]      nameserver0=8.8.8.8

connman-conf only does the same thing again by (badly and incompletely)
parsing those parameters with sed.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>