CI / test (3.10) (push) Successful in 24s
CI / test (3.11) (push) Successful in 23s
CI / test (3.12) (push) Successful in 24s
CI / test (3.10) (pull_request) Successful in 24s
CI / test (3.11) (pull_request) Successful in 22s
CI / test (3.12) (pull_request) Successful in 25s
On every Ubuntu host with unattended-upgrades, get_host_status() read the package manager as busy, so an interrupted dpkg was never reported there. Ubuntu keeps unattended-upgrade-shutdown --wait-for-signal running all the time; its process name is cut to 15 characters, unattended-upgr, the same as a real run's. BUSY_CHECK now matches dpkg, apt, apt-get and aptitude by name and unattended-upgrade by its command line. The tests run it through sh with a stand-in ps, and check that the command does not match itself: over an exec channel it is the command line of the shell that runs it. Closes #26