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

[Steve Langasek]

Successful bionic image builds showing livecd-rootfs 2.525.10 from
-proposed in use:

https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/bionic/ubuntu-server-live/+build/151051
https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/bionic/ubuntu-server/+build/151041
https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/bionic/ubuntu/+build/151054

No discernable improvement to the build times, but that's ok.

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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https://bugs.launchpad.net/bugs/1799773

Title:
  Accelerate the build: Drop unused checksum generation

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Xenial:
  Fix Committed
Status in livecd-rootfs source package in Bionic:
  Fix Committed
Status in livecd-rootfs source package in Cosmic:
  Fix Released

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
   * The checksums are included beside the squashfs in live-build ISOs but none of our projects use live-build to build ISOs.

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