[Bug 1799773] Re: Accelerate the build: Drop unused checksum generation

[Robert C Jennings]

This change was made during the cosmic development cycle in r1685[1].

[1] https://bazaar.launchpad.net/~ubuntu-core-dev/livecd-
rootfs/trunk/revision/1686

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Title:
  Accelerate the build: Drop unused checksum generation

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  [Impact]

   * Image builds take time
   * Some of the time is spent computing checksums
   * Those checksums are never used
   * Time and energy is wasted
   * build/(md5|sha256)sum.txt is not used by livecd-rootfs and not exposed by launchpad-buildd

  [Test Case]

   * Build images
   * Disable checksums
   * Build images
   * Ensure image deliverables are unchanged 

  [Regression Potential]

   * Someone was using the checksums outside of launchpad-buildd;
  because launchpad-buildd doesn't present those artifacts

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