mod_h2

Via: svn merge -r10:HEAD https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.17-protocols-http2


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1705682 13f79535-47bb-0310-9956-ffa450edef68