Merge lp:~patviafore/vmbuilder/automated-ec2-builds into lp:~ubuntu-on-ec2/vmbuilder/automated-ec2-builds [a=patviafore] [r=davidkrauser,rcj]
Update remove-old-dailies to handle 2020s
MP: https://code.launchpad.net/~patviafore/vmbuilder/automated-ec2-builds/+merge/378610