Refresh if maintenance mode is over

Using status.php for this.
I modified status.php to also show, whether we're in maintenance.

Checks every 20 seconds if maintenance is over, if yes: reload.
repair search lucene before installing
Load apps in test situations
Fix mkdir error in mountconfig.php
Fix contructor in test
[tx-robot] updated from transifex
Merge pull request #9698 from owncloud/fix-9666

Load apps in tests, fixes #9666
Merge pull request #10962 from owncloud/repair_search_lucene

repair search lucene before installing
Merge pull request #3937 from owncloud/refresh_if_maintenance_is_over

Refresh if maintenance mode is over
Reuse known fileids in the scanner
Cast mtimes to int
Reuse cache data of existing files during scan
Cast size to int
Reuse known cached data of folders