Log to Stderr instead of Stdout (#1698)
Log to Stderr instead of Stdout (#1698)

Also fix an error message
Oncilla/scion,klausman/scion,netsec-ethz/scion,klausman/scion,netsec-ethz/scion,netsec-ethz/scion,Oncilla/scion,Oncilla/scion,Oncilla/scion,klausman/scion,klausman/scion,netsec-ethz/scion,klausman/scion