BackendVdcs are read only at dss start.
Functionality is enabled only when file /etc/ds-conf/dss-backend-vdcs-enabled contains true. At least threading and baseurl shall be improved before it is active by default.
- backendVdcs: readout vdcs at dss start
- ds: introduce ds-conf
- vdc: refactor vdc capabilities to match documentation
- vdc: remove dead hasDevices, hasTemperatureControl from VdcSpec
- vdc: move vdc-connection.h:VdcSpec_t -> vdc.h:VdcSpec
https://trello.com/c/hXOyPEps/55-integrate-vdc-in-dss-datamodel