Sub-requests have to have a value for their request_config structure,

or we'll seg-fault.  This should set the sub-request's request_config
structure to the same exact same structure as the main request is using.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86655 13f79535-47bb-0310-9956-ffa450edef68