Comment 7 for bug 2049785

@Chris, updating the Depends on u-a-t to >= 30 fixes the obvious error case which can be hit when offline with the old version, but the idea was also to make the update-manager code more robust to parsing error/unexpected output from the pro command and also take the opportunity to move away from parsing the output of a cmdline utility to use a stable API.

Let me know if you think that's enough of a rational for the uploaded changes, maybe with an updated SRU description and testcase, or if you would still prefer to see us uploading the simpler 'bump the depends' fix