Pull out "does request have a body" logic to a central

canon function and use that for the 100-Continue OK
check.

Should likely also start using this in the various
other places we do this "have body" check thruout
the codebase...


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@986699 13f79535-47bb-0310-9956-ffa450edef68