MINOR: pattern: forbid dns resolutions

This patch adds the flags "-n" on the acl parser. the flag "-n" forbif
the DNS resolutions. The maps have always the dns resolutions disabled.
diff --git a/include/types/pattern.h b/include/types/pattern.h
index 839eae6..3859eda 100644
--- a/include/types/pattern.h
+++ b/include/types/pattern.h
@@ -65,6 +65,7 @@
 enum {
 	PAT_F_IGNORE_CASE = 1 << 0,       /* ignore case */
 	PAT_F_TREE        = 1 << 1,       /* some patterns are arranged in a tree */
+	PAT_F_NO_DNS      = 1 << 2,       /* dont perform any DNS requests */
 };
 
 /* ACL match methods */