Comment 1 for bug 1631010

I put a branch at https://code.launchpad.net/~smoser/ubuntu/+source/initramfs-tools/+git/initramfs-tools/+ref/lp-1631010 with a fix for this.

other improvements too:
    improvements to dhclient handing of ip= command lines.

    Improvemnts here are:
     a.) do not leave /run/net-* around if dhclient failed
     b.) support ip6= on the kernel cmdline
         ip6=
            off : default. ip= does not mean to do ipv6
            only : only do ipv6 (no ipv4)
            on : always do ipv6 even if ipv4 succeeded.
            iff : do ipv6 if and only if ipv4 fails
     c.) wait for link local address to settle (dad) before
         attempting to dhcp -6
     d.) do not run through the dhcp configure once for each ROUNDTTT