Unable to establish contact sync with DAVdroid 1.0.x (Fix #1)
This merge request fixes a regression in DAVdroid 1.x which fails to detect addressbooks resources when pointing to a calendar resource and vice versa. RFC 2518 allows querying of arbitrary properties like, in that context, RFC 6352. DAVdroid 1.x fails to query calendar/addressbook properties with Header "Depth: 1" during account creation. This merge request restores the functionalty of DAVdroid 0.9.x.