Added timeout_set for worker. Each worker can have a different timeout

the ProxyTimout sets. Also changed proxy_conf's timeout_set to int.

Use timeout_set for worker inherited from ProxyTimeout but overridable
using timout=xxx

Submitted by: mturk


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@104592 13f79535-47bb-0310-9956-ffa450edef68