TPF platform-specific changes:

   Ensure children close their sockets upon shutdown.
   Fix KeepAliveTimeOut and TimeOut processing.
   Implement SIGUSR1 (graceful restart) and SIGHUP (restart now).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@381696 13f79535-47bb-0310-9956-ffa450edef68