cfg. parser: fix warnings

- removed flex input warnings
- workaround for bison conflicts warnings (%expect ...)

cfg.lex

@@ -84,6 +84,7 @@
  *  2010-02-17 added DST_BLST_{UDP,TCP,TLS,SCTP}_IMASK (andrei)
 */
 
+%option noinput
 
 %{
 	#include "dprint.h"

cfg.y

@@ -101,6 +101,8 @@
  * 2010-02-17  added blacklist imask (DST_BLST_*_IMASK) support (andrei)
 */
 
+%expect 5
+
 %{
 
 #include <stdlib.h>