Plug in the new logger intercept

[ldemailly]

go run -race . -h2 -config-dir sampleConfig/ -redirect-port :8081 -https-port :8443 -http-port :8001 -loglevel debug
# and
fortio curl -resolve localhost https://debug.fortio.org:8443

now yield

instead of the plain text non json version before:

(finishes fixing fortio/fortio#802 with different src attributes)