Merge r399947, r406697 from trunk:

Merge r399947, r406697 from trunk:

* 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.

* Document r399947, addition of optional scheme:// to ServerName directive

PR: 33398
Submitted by: sctemme
Reviewed by: sctemme, rpluem, wrowe

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@425051 13f79535-47bb-0310-9956-ffa450edef68