Generic DbFetcher code was refactored to VdcDbFetcher. Recovery from VdcDb was moved to VdcDbFetcher.
The code removes dependencies on plugins and events.
It uses taskprocessor to run the synchronous http code.
VdcDb instance holds lock, to avoid concurrency errors from sql.#14543
TODO in dss-oe: Modify dss run script to write 0 to config/vdcDbFetcher/periodSeconds.