* nghttpx: Fix crash with backend failure
* nghttpx: Better distribute load to backend h2 servers
* nghttpx: Fix error messages on deprecated mode
* nghttpx: Fix bug that logger wrote string which was not
NULL-terminated
* nghttpx: Fix bug that proxy with HTTP/1.1 CONNECT did not work
OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/nghttp2?expand=0&rev=53
