We have currently support for WebDAV schemes as vnd.sun.star.webdav://
but it is not user and tools friendly.

Some related refactoring in ucb to reuse existing code instead of
manual parsing of URLs.

Change-Id: Ib14411796d6cf11afd80d5132abe67d4e46a42e1
Reviewed-on: https://gerrit.libreoffice.org/48585Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>