Submitted by: Alexei Kosut

Reviewed by: Mark Cox

Add some more useful directives for logging.

%U: the URL path that was requested
%f: the filename.
%P: the PID of the child that served the request (this might be useful
    for tracking the BROKEN_WAIT problem; I dunno.)

It also adds a %{...}n directive that returns the contents of a note
(from the r->notes table). The idea of this is that modules can set
notes with data to be logged. This patch, as an example, has
mod_cookies put its cookie into a note called "cookie". This allows
mod_log_config to log it without having to use a seperate cookie log


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@76813 13f79535-47bb-0310-9956-ffa450edef68