Delete cookie instead of emptying value

Remove apps/files/appinfo/remote.php - this is no longer used

Combine OCS API getUser method code into provisioning_api app

ellipsize long group names in select2 dropdown, fix #16977

fix filepicker loading spinner

[OCI setup] remove static logger/config calls

* logger/config object are already injected - this only uses it

PHP will handle session cookies with an empty values as an E_WARNING error. ([php/#68063](https://bugs.php.net/bug.php?id=68063))

ownCloud sets the cookie to an empty value in case the session expires, it however after this starts a new session. Due to potential race conditions this can in unlikely cases lead to the fact that the session never gets restarted and the user is left with an empty cookie. PHP tries then to use the empty cookie which makes the instance not usable.

To work around any race condition we now tell PHP to explicitly delete the value which can be done by using `null` as value, PHP will then send a cookie with the value "deleted". Also theepiration has been set to -1.

don't move files in cache twice, fixes renaming for objectstores

skip btrfs hack for objectstore docker container on btrfs host

Removemount expects absolutePath

The full name has to be tested if it's a dir

Increase the 2nd digit of shipped apps