Log Message:
nghttp2: updated to 1.39.2

nghttp2 v1.39.2

This release fixes CVE-2019-9511 “Data Dribble” and CVE-2019-9513
“Resource Loop” vulnerability in nghttpx and nghttpd. Specially crafted HTTP/2
frames cause Denial of Service by consuming CPU time. Check out
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
for details. For nghttpx, additionally limiting inbound traffic by --read-rate \ 
and --read-burst options is quite effective against this kind of attack.

Fix CVE-2019-9511 and CVE-2019-9513
Add nghttp2_option_set_max_outbound_ack API function
nghttpx: Fix request stall