Merge r552029 from trunk:

* server/mpm/prefork/prefork.c (child_main): Stop processing new
connections if shutdown_pending is set, i.e. when SIGTERM is received
in single-proecss mode.

Submitted by: Garrett Rooney <rooneg apache.org>
PR: 38848

Submitted by: jorton
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@662012 13f79535-47bb-0310-9956-ffa450edef68