This bug was fixed in the package initramfs-tools - 0.122ubuntu8.5

---------------
initramfs-tools (0.122ubuntu8.5) xenial; urgency=medium

  * scripts/functions: Revert configure_networking changes to the state at
    0.122ubuntu8.1. (LP: #1631474)

 -- Mathieu Trudel-Lapierre <cypher...@ubuntu.com>  Thu, 13 Oct 2016
17:19:56 -0400

** Changed in: initramfs-tools (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1631474

Title:
  No networking with initramfs-tools 0.122ubuntu8.3 and ip=dhcp boot
  option

Status in initramfs-tools package in Ubuntu:
  Fix Committed
Status in initramfs-tools source package in Xenial:
  Fix Released
Status in initramfs-tools source package in Yakkety:
  Fix Committed
Status in initramfs-tools source package in Zesty:
  Fix Committed

Bug description:
  [Impact]

   * 0.122ubuntu8.3 of initramfs-tools no longer correctly processed
  ip=dhcp or ip=:::::eth0:dhcp

   * Regression-updates

   * The fix better parses the ip= command line argument.

  [Test Case]

   * Create a machine that boots using an nfsroot.

   * Use ip=:::::eth0:dhcp on the kernel command line.  To set up
     networking.

   * Discover that the device never comes up because, networking is not
  configured correctly.

  [Regression Potential]

   * Regressions potential is limited to machines using
  ip={""|::::*|on|any|dhcp} on the kernel command line.  As this is
  already broken regression potential is minimal.  This is common on
  machines that use nfsroot or otherwise pxe boot.

  [Other Info]

   * There are a number of other issues in this code base that are not solved 
by this fix.
     - The ?*:?*:?*:?*: use case falls through to the default case, and likely 
breaks there.  As such static assignment via ip= appears broken
     -
   * The networking configuration does not strictly follow the kernel 
documentation as described 
https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt . This 
should be fixed.

  This bug is a regression of changes made under bug 1628306.

  ====================Original Bug Description Follows==================

  initramfs-tools 0.122ubuntu8.3 introduced a serious regression where
  networking is not initialized when the boot option "ip=dhcp" is
  provided. We are seeing this problem in AWS, but cannot confirm if
  this issue is specific to AWS or will occur with different hardware or
  in different environments.

  Removing "ip=dhcp" from the boot options with 0.122ubuntu8.3 results
  in networking being configured.

  The issue does not occur with 0.122ubuntu8.2 or previous versions when
  "ip=dhcp" is set.

  AWS has no console so debugging is not a trivial task. I do have a
  console log with some output, and will update this bug shortly with
  it.

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