permissions: max size of subnet array set to 512

- was 128, which can be insufficient for large interconnect

modules/permissions/hash.h

@@ -176,7 +176,7 @@ int addr_hash_table_rpc_print(struct addr_list** table, rpc_t* rpc, void* c);
 void empty_addr_hash_table(struct addr_list** hash_table);
 
 
-#define PERM_MAX_SUBNETS 128 
+#define PERM_MAX_SUBNETS 512
 
 
 /*