Security update from 1.15.5 to 1.15.6.
Temporary disable third-party upstream_fair module, it should
be updated to build with the modern version of the nginx.
While I'm here fix some whitespaces.
Approved by: ports-secteam (miwi)
*) Security: when using HTTP/2 a client might cause excessive memory
consumption (CVE-2018-16843) and CPU usage (CVE-2018-16844).
*) Security: processing of a specially crafted mp4 file with the
ngx_http_mp4_module might result in worker process memory disclosure
*) Feature: the "proxy_socket_keepalive", "fastcgi_socket_keepalive",
"scgi_socket_keepalive", and "uwsgi_socket_keepalive" directives.
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