Merge r1333969:

    Use the the same hostname for SNI as for the HTTP request when forwarding
    to SSL backends.

    PR: 53134
    Based on a patch from: Michael Weiser <michael weiser.dinsnail.net>

Reviewed by: rpluem, druggeri, covener


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1356881 13f79535-47bb-0310-9956-ffa450edef68