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

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
            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

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  please add a cmdline option to chose between ipv4, ipv6, or dual-stack
  network boot

Status in initramfs-tools package in Ubuntu:

Bug description:
  Right now, I can boot with "ip=::::hostname:BOOTIF" in the kernel
  commandline, and (after bug 1621507), I get whatever it came up with
  for ipv4 and ipv6.  If for nothing more than testing on a dual-stack
  environment, it would be nice to be able to force that to try both
  (current behavior, and an excellent default), only try IPv4, or only

  NOT something that needs to be fixed before yakkety, but would be nice
  to eventually get back to xenial.

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