Follow up to r1859371: extend to other ap_proxy_connection_create[_ex]() users.

This function now now handles SSL reuse as well as the "proxy-request-hostname"
note (SNI), so let's also call it unconditionnaly in all proxy modules.

On the mod_ssl side, since this note has the lifetime of the connection, don't
reset/unset it during handshake (ssl_io_filter_handshake).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1859422 13f79535-47bb-0310-9956-ffa450edef68