Refactor ap_read_request() to separate the parts that do socket reads

from the parts that update the request_rec.  This is a step towards
nonblocking, event-driven read support.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/async-read-dev@349068 13f79535-47bb-0310-9956-ffa450edef68