Remove all cookie algorithms but AES, which was used as a default, for legacy purposes.

lib/ns/include/ns/types.h

@@ -27,9 +27,7 @@ typedef struct ns_server		ns_server_t;
 typedef struct ns_stats			ns_stats_t;
 
 typedef enum {
-	ns_cookiealg_aes,
-	ns_cookiealg_sha1,
-	ns_cookiealg_sha256
+	ns_cookiealg_aes
 } ns_cookiealg_t;
 
 #endif /* NS_TYPES_H */