Make cert gen less eager (#1471)
Make cert gen less eager (#1471)

Don't generate a cert without -f if the cert already exists on disk.
Oncilla/scion,netsec-ethz/scion,Oncilla/scion,Oncilla/scion,klausman/scion,netsec-ethz/scion,Oncilla/scion,netsec-ethz/scion,klausman/scion,netsec-ethz/scion,klausman/scion,klausman/scion,klausman/scion