showpath: fix panic and use default sciond socket (#1448)
showpath: fix panic and use default sciond socket (#1448)

showpath: fix panic and use default sciond socket

Panic was caused by doing Flush before setting the log.
We do not really need the log facility for this app, so remove it.

Also use a default sciond path socket to connect to in case neither
sciond nor srcIA flags are set.
Oncilla/scion,netsec-ethz/scion,netsec-ethz/scion,Oncilla/scion,klausman/scion,Oncilla/scion,netsec-ethz/scion,klausman/scion,netsec-ethz/scion,klausman/scion,klausman/scion,Oncilla/scion,klausman/scion