Automatic refresh of private snaps

[pedronis]

yes, but in 2.31 we are also fixing the automatic bit:

Refresh snaps with needed credentials

In 2.30 we started tracking for each snap the userID of the installing user, snap refresh foo will also set this for a snap that didn’t have yet the information. The plan now is to use that information to refresh snaps in groups with the credentials of their installing users. This work addresses: https://bugs.launchpad.net/snapd/+bug/1733910