pathdb: Don't do manual string interpolation for queries (#1794)
pathdb: Don't do manual string interpolation for queries (#1794)

Fixes #1791
klausman/scion,klausman/scion,klausman/scion,Oncilla/scion,klausman/scion,netsec-ethz/scion,netsec-ethz/scion,netsec-ethz/scion,netsec-ethz/scion,Oncilla/scion,Oncilla/scion,Oncilla/scion,klausman/scion