Change apr_proc_detach to take a parameter that can enable/disable automatic

forking (aka, to "daemonize").

Detailed explanation: If we are only interested in detaching from the
controlling terminal, then we are only interested in creating a new
process group (or creating a new session, which implicitly creates a
new process group). In order to do so, we must _NOT_ already be
a process group leader. The only way to ensure that is true, we normally
will call fork() and allow the parent to exit, ensuring that the child
is at least a child of a process group leader (and not one itself).

Doing this by default prevents some process-watching tools from working
with Apache. Therefore, when calling apr_proc_detach with
APR_PROC_DETACH_FOREGROUND, the caller is taking responsibility
for _NOT_ being a process group leader, which is guaranteed by
such process management tools.

[A similiar patch was originally submitted Jos and later modifed by Aaron.]

Obtained from:  Jos Backus <josb@cncdsl.com>
Submitted by:	Aaron Bannert


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@63044 13f79535-47bb-0310-9956-ffa450edef68

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