React to failed upgrades

[pabloyoyoista]

Currently, when upgrades fail, the thing we do is print the failed transaction and roll-back the state of every app. People can then retry upgrades, which would usually fix most of the things.

However, this is suboptimal, since failures can be of different kinds:

• Some apps failed to upgrade (connection errors, for example)
• There was some replace error
• Some bigger consistency or FS error in the process.
• ...

Some of this might leave the system in a dangerous state, some might require an apk fix, and some might be totally fine, but just require a new upgrade to finish those inaccessible packages. Providing a proper message to users (e.g: run apk upgrade -a or apk fix and set the status of the packages in GS would be ideal.