In HTTP/1.1, whether or not a request message contains a body

In HTTP/1.1, whether or not a request message contains a body
is independent of the request method and based solely on the presence
of a Content-Length or Transfer-Encoding.  Therefore, our default
handlers need to be prepared to read a body even if they don't know
what to do with it; otherwise, the body would be mistaken for the
next request on a persistent connection.  discard_request_body()
has been added to take care of that.

PR: 378
Reviewed by: Dean Gaudet

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3@78677 13f79535-47bb-0310-9956-ffa450edef68