[Merge] ~xnox/ubuntu-release-upgrader:ignore-base-tasks into ubuntu-release-upgrader:ubuntu/master

[Brian Murray]

If nobody objects I'm going to merge and upload this on 2020-05-05.
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https://code.launchpad.net/~xnox/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/382970
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~xnox/ubuntu-release-upgrader:ignore-base-tasks into ubuntu-release-upgrader:ubuntu/master.