Added the optional ssl_enable functions to allow mod_proxy to hook into

mod_nw_ssl on NetWare.  This allows a unsecure connection to be upgraded
to a secure connection when required by mod_proxy.  Also added the
directive NWSSLTrustedCerts to allow an administrator to provide a list of
certificates used to upgrade the secure connections.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@99006 13f79535-47bb-0310-9956-ffa450edef68