Support for changing the MAC address on an ethernet interface

Adding the following code to /etc/network/modules/iproute2.sh adds
support for changing the MAC address for an interface
----  snip  ----
public_address() {
        code="ip link set $if address $1" ; shift
        addcode up 5 3 "$code"
        iproute2_init_if
}
----  snip  ----

Tested it (on an eth interface) and it works (for me;-)
Don't ask me what 5 and 3 for `addcode` mean.

	Bernd
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