Output entries for when downloading and installing apps

[PVince81]

Because else it just sits there for a while and the admin doesn't know what it's doing.

Also, have this visible without requiring -vvvv

@VicDeo

cc @butonic

[butonic]

After Turned on maintenance mode it executes tons of repair steps ...

[VicDeo]

@PVince81 it's a core thing. Repair step can use either info or warning right now
https://github.com/owncloud/core/blob/master/lib/public/Migration/IOutput.php

info isn't shown in non-verbose mode while warning is red and brutal.

[PVince81]

doesn't matter where the fix needs to go...

[butonic]

in general I would prefer to run the occ commands very verbose by default and add a quiet option if you really want no output. Personally, I hate the progressbars with a passion. They hide all the useful information: which user is it syncing, which file is it scanning. I don't want to run the command twice to hope it fails exactly the same way when adding debug output ...

[patrickjahns]

This should be handled by these two prs in core:

owncloud/core#28876
owncloud/core#28813

Also #143 should help with defining <error> tags for symfony console output