[Bug 1782802] Re: use dhclient -4 instead of ipconfig in easy cases in 18.10

[Benjamin Drung]

As mentioned in bug #1790418 there is still one call to ipconfig that
hasn't been replaced (as of initramfs-tools 0.142ubuntu19 in noble).

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Title:
  use dhclient -4 instead of ipconfig in easy cases in 18.10

Status in initramfs-tools package in Ubuntu:
  Confirmed

Bug description:
  When adding ipv6 netboot support to initramfs-tools in yakkety/zesty,
  this was initially attempted with replacing ipconfig with dhclient.
  As described in LP: #1621507, the use of dhclient for ipv4 dhcp was
  backed out in favor of ipconfig.  So at the moment, we are using both
  ipconfig from klibc-utils and dhclient from isc-dhcp-client in the
  initramfs.

  We want to switch off of klibc-utils completely and use isc-dhcp-
  client for both ipv4 and ipv6 in initramfs-tools. But for cosmic,
  we'll only do the easy bits. Bug 1790418 is about finishing the job.

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