When hitting the `/contactsmenu/contacts` endpoint with the `dav.system_addressbook_exposed` config switch set to `"no"`, the system address book content is still listed in the response.
This ensure that we do not expose unexpectedly the system address book.
Signed-off-by: Louis Chemineau <louis@chmn.me>
Those constants are not used anywhere anymore and are deprecated for
more than ten versions. So its time to cleanup the interface.
Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
