Exception if cleanup called before any request handled

[OverDrone]

TusFileUploadService.cleanup()
calls
DiskStorageService.cleanupExpiredUploads(...)
and
DiskLockingService.cleanupStaleLocks()
Those methods throw "directory does not exist" exception if not a single upload was processed, because private method
AbstractDiskBasedService.init()
was never called.

How to fix:

Call
AbstractDiskBasedService.init()
inside
DiskStorageService.cleanupExpiredUploads(...)
and
DiskLockingService.cleanupStaleLocks()