MINOR: ssl : add statements 'notlsv11' and 'notlsv12' and rename 'notlsv1' to 'notlsv10'.

This is because "notlsv1" used to disable TLSv1.0 only and had no effect
on v1.1/v1.2. so better have an option for each version. This applies both
to "bind" and "server" statements.
diff --git a/include/types/server.h b/include/types/server.h
index 25a0174..7c5dd87 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -175,7 +175,9 @@
 		SSL_SESSION *reused_sess;
 		char *ciphers;			/* cipher suite to use if non-null */
 		int nosslv3;			/* disable SSLv3 */
-		int notlsv1;			/* disable TLSv1 */
+		int notlsv10;			/* disable TLSv1.0 */
+		int notlsv11;			/* disable TLSv1.1 */
+		int notlsv12;			/* disable TLSv1.2 */
 	} ssl_ctx;
 #endif
 	struct {