Return OC-Fileid after MKCOL call (alternative fix with SabreDAV patch)

Alternative fix for https://github.com/owncloud/core/issues/9000 that only returns OC-Fileid (no Etag) but uses a simpler approach.

Requires SabreDAV patch: https://github.com/fruux/sabre-dav/pull/504
Temporary patch for 3rdparty: https://github.com/owncloud/3rdparty/pull/115

@DeepDiver1975 @icewind1991 @th3fallen