Set env $PROTO to SSL6 if remote ip has ':' colon character instead of default SSL

Signed-off-by: Giam Teck Choon <giamteckchoon@gmail.com>
Update sslserver.1 and sslclient.1 about options -4 and -6

Signed-off-by: Giam Teck Choon <giamteckchoon@gmail.com>