Fix display bug in e2e, and make timeouts failures.
Fix display bug in e2e, and make timeouts failures.

The previous code modified src every iteration, so the first time it
would print '(1, 10)', and the next time it would be 'ISD_AD(1, 10)' or
similar.

dmpiergiacomo/scion,klausman/scion,FR4NK-W/osourced-scion,dmpiergiacomo/scion,dmpiergiacomo/scion,klausman/scion,Oncilla/scion,klausman/scion,netsec-ethz/scion,FR4NK-W/osourced-scion,dmpiergiacomo/scion,netsec-ethz/scion,dmpiergiacomo/scion,dmpiergiacomo/scion,FR4NK-W/osourced-scion,klausman/scion,klausman/scion,FR4NK-W/osourced-scion,Oncilla/scion,netsec-ethz/scion,FR4NK-W/osourced-scion,netsec-ethz/scion,Oncilla/scion,Oncilla/scion