Refactor out the child behavior from mpm_winnt. This is the first

  Refactor out the child behavior from mpm_winnt.  This is the first
  step in making a legible multiprocess windows mpm, or at least
  structuring the code to always begin a new child as an old one is
  going to die soon, rather than waiting for it's final dying breath.

  The only code that had to be affected [due to the split and general
  structure of the code] was merging the set_listeners_noninherited()
  code directly into the get_listeners_from_parent code, and also into
  the apr socket.c code for winnt.  For the most part the code splits
  rather nicely.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96221 13f79535-47bb-0310-9956-ffa450edef68