Use HTTP compressed encoding when available

[job]

This reduces network traffic by about 50%.

Without patch applied:

# systemd-run -p IPAccounting=yes --wait ./src/fort --tal=/etc/tals/ --mode=standalone --output.roa=/tmp/roa1 --local-repository=/home/fort1
Running as unit: run-u5244.service
Finished with result: success
Main processes terminated with: code=exited/status=0
Service runtime: 9min 243ms
CPU time consumed: 6min 59.190s
IP traffic received: 1.1G
IP traffic sent: 17.5M

With patch applied:

# systemd-run -p IPAccounting=yes --wait ./src/fort --tal=/etc/tals/ --mode=standalone --output.roa=/tmp/roa2 --local-repository=/home/fort-http-compression
Running as unit: run-u5246.service
Finished with result: success
Main processes terminated with: code=exited/status=0
Service runtime: 8min 44.294s
CPU time consumed: 10min 44.351s
IP traffic received: 572.1M
IP traffic sent: 8.3M

Comparison with rpki-client which uses HTTP compression when available:

# systemd-run -p IPAccounting=yes --wait rpki-client -v -d /home/rpkiclient /tmp
Running as unit: run-u5208.service
Finished with result: success
Main processes terminated with: code=exited/status=0
Service runtime: 7min 17.549s
CPU time consumed: 5min 27.936s
IP traffic received: 547.3M
IP traffic sent: 8.6M

[ydahhrk]

Thanks; this is awesome!