This help us getting rid of useless traffic by crawlers.
It is enabled for gerrit01 which is suffering the most from this.
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
* flip off proxy_buffering again
* enable REVWALK_USE_PRIORITY_QUEUE
* enable delta compression, because that's not a bottleneck and it's
nicer on bandwidth