Combine the calls to add the core_filter to one place. Basically, it is

Combine the calls to add the core_filter to one place.  Basically, it is
safe to add the core_filter during the post_read_request, and it means
that we only have to add the filter once in the code.  This should make
it easier to add an SSL module in the future.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86307 13f79535-47bb-0310-9956-ffa450edef68