Additional DIRECT connection options

Please add an advanced option to specify SSL_SERVER_CERT_DN under a DIRECT connection (http://docs.oracle.com/database/121/NETRF/tnsnames.htm#NETRF291).

This will allow direct TCPS connections when the sqlnet.ora contains "SSL_SERVER_DN_MATCH=yes"(http://docs.oracle.com/database/121/NETRF/sqlnet.htm#NETRF234)

Thanks!