"Waiting for conflicting change in progress..." when uninstalling multiple snaps

[Dan Watkins]

I was looking through my installed snaps, and realised that I no longer needed anbox or canonical-livepatch installed, so I decided to remove them:

```
$ snap remove anbox canonical-livepatch
2018-12-03T19:13:24Z INFO Waiting for conflicting change in progress...
2018-12-03T19:13:30Z INFO Waiting for conflicting change in progress...
2018-12-03T19:13:35Z INFO Waiting for conflicting change in progress...
2018-12-03T19:13:41Z INFO Waiting for conflicting change in progress...
2018-12-03T19:13:46Z INFO Waiting for conflicting change in progress...
anbox removed
canonical-livepatch removed
```

These conflicting change messages are output at seemingly arbitrary points during the 50 seconds that this command took to run, without any explanation interleaved. Given that everything eventually succeeded, are these messages that an end user actually needs to see?

(I was able to reproduce these messages by reinstalling these snaps and then re-running the above command.)

[Dan Watkins (oddbloke)]

(Note that you'll want to reinstall the snaps separately if you're trying to reproduce, due to https://bugs.launchpad.net/snapd/+bug/1808051.)

[Dan Watkins (oddbloke)]

Not 100% clear to me why the much newer bug wasn't marked as a dupe of this one, but hopefully someone will actually pay some attention to that one!