The commit of unifying the Reva Client config introduced some backwards
incompatible changes to the config structures and yaml config tags. For
the "thumbnails", "webdav" and "notifications" service. This reverts the
changes on the service and introduces TLS options in a backwards
compatible manner.
Consolidate all services to use the Reva config struct for the shared package.
This works because all services (except 'notifications', 'thumbnails' and
'webdav') where using the same config keys and environment variables for
setting the reva gateway.
