Add optional 'scheme://' prefix to ServerName directive. For

     'https', mod_http returns "https" for the ap_hook_http_scheme and
     DEFAULT_HTTPS_PORT for ap_hook_default_port.  This fixes Redirect
     responses to requests for directories without a trailing slash
     when httpd runs behind a proxy or offload device that processes
     SSL.  It also enables support for Subversion in that
     configuration.  This change is completely backwards compatible
     and passes the perl-framework.  Minor mmn bump because I add a
     field to server_rec. 


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@399947 13f79535-47bb-0310-9956-ffa450edef68