[Bug 1579192] Re: [SRU] dhclient.conf regression in walinuxagent 2.0.16-0ubuntu2~12.04.0

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Title:
  [SRU] dhclient.conf regression in walinuxagent 2.0.16-0ubuntu2~12.04.0

Status in walinuxagent package in Ubuntu:
  In Progress

Bug description:
  [Test Case]

  Repro:
   - Create an Ubuntu 12.04 VM in Azure
   - Upgrade to the latest walinuxagent package for Precise (2.0.16-0ubuntu2~12.04.0)
   - Change the hostname
   - Run "sudo ifdown eth0 && sudo ifup eth0"
   - After a few seconds run "hostname -f"

  Expected: Hostname is resolvable.

  Result: Hostname is not resolvable because the new hostname was not
  sent to the DHCP server, because the dhclient.conf configuration is
  incorrect.

  [Regression Potential]

  The new postinst performs a sed which will only catch the line that
  was incorrectly sed'ed in the previous version of the package.
  Regression potential is minimal.

  [Original Report]

  The latest walinuxagent 2.0.16-0ubuntu2~12.04.0 package for Precise
  included the postinst file from the Trusty package. The postinst
  script configures dhclient.conf so that the DHCP client sends the
  system's current hostname to the DHCP server. Unfortunately, the
  dhclient.conf configuration is different for Precise and Trusty, and
  thus this functionality regressed in Precise.

  The solution is to just replace the postinst file in the Precise
  package for the 2.0.16 walinuxagent with one from an older/correct
  package, and rebuild the package.  If it helps I've attached the
  correct postinst file for Precise to this bug.

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