Merge r1594625 from trunk:

mod_proxy_wstunnel: Fix the use of SSL connections with the "wss:" scheme.
                    PR55320.

Submitted by: Alex Liu <alex.leo.ca gmail.com>
Committed by: ylavic

Submitted by: ylavic
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1598603 13f79535-47bb-0310-9956-ffa450edef68