Timeout when max-childrens reached.

Description

Referring to:
https://bz.apache.org/bugzilla/show_bug.cgi?id=66603

It will be nice to set a timeout limit when connection will be terminated after trying to get free childrens of php-fpm. These limit should be smaller then max_execution_time or apache's timeouts because it will help with durability durring ddos attacks or with bugged apps. It specially important for shared servers, while one of app will reached max-childrens and there will be still incomming connections, so with waiting for childrens in infinity time or 300 seconds like apaches do it's to long and another limit's of server can be reached. These connections must be terminated alot faster, and timeout of http server cannot be smaller because of max_execution_time.

Empieza leyendo el informe de Bugzilla enlazado sobre la espera de PHP-FPM después de alcanzar max_children y, a continuación, localiza los puntos de entrada de las conexiones de PHP-FPM y de la gestión de procesos hijo. Define el comportamiento del timeout configurable y sus casos de fallo antes de identificar las pruebas relevantes; se considera terminado cuando las conexiones sobrecargadas terminan dentro de ese límite sin cambiar el comportamiento existente de los timeouts de ejecución o HTTP.