Fixed issues with renaming

- summary is now untouched on rename instead of bogus incrementation
- fixes "Share" status icon by only triggring "fileActionsReady" once
- row is now reinserted even when rename is cancelled, this removes the
  hacky/buggy code that tried to rename the element back
- added unit tests to cover the fixed cases
use custom logfile path if defined, otherwise use default of owncloud.log in data directory
Merge pull request #8612 from owncloud/share-updateshareiconsafterrename

[master] Fixed issues with renaming
move the mount point up if a share is mounted to a subfolder and the subfolder no longer exists
Merge pull request #8652 from owncloud/logfile_rotate

rotate custom logfile if defined
Merge pull request #8416 from owncloud/sharing_keep_mount_points_visible

[sharing] move the mount point up if the parent folder no longer exists
allow admin to disable sharing for specific groups of users