fix for failure of dht testcase due to long wait for hostkey generation. testcase...

fix for failure of dht testcase due to long wait for hostkey generation. testcase now uses gnunet-peerinfo to generate the hostkey first, then runs gnunet.  A much better fix would be to have services that need a hostkey not report to arm that they are happily running when they may hang indefinitely trying to generate or retrieve a hostkey.  Or if most things really need a hostkey have gnunet-service-arm generate the damned thing BEFORE starting services.