* Implement writing of MSO lockfiles
* Grab the already implemented parsing code (tryMSOwnerFile method)
and put it together into one class
* Add tests about the generated URL for lockfiles and the lockfile content
* MSO lockfiles are not written yet by LO, next step is to integrate
this code into the locking mechanism.

Change-Id: I3b0ed1975cd57dfd006d4e1890b23c307890de5c
Reviewed-on: https://gerrit.libreoffice.org/69582
Tested-by: Jenkins
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>