Move draft-ietf-httpbis-p1-messaging-23 fixes to proposed backport (was being...

Move draft-ietf-httpbis-p1-messaging-23 fixes to proposed backport (was being worked) like in 2.2.x, with my +1 vote.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1572499 13f79535-47bb-0310-9956-ffa450edef68