ubus/datastorage: cleanup

- Remove the linked list of rejected auth / assoc as it was not used for any decision making
- Rename auth_req to client_req as it is also used by association requests

[cleanup commit message]
Signed-off-by: Nick Hainke <vincent@systemli.org>

src/include/test_storage.h

@@ -11,6 +11,5 @@ void ap_array_insert(ap *entry);
 
 int ap_array_delete(ap *entry);
 
-auth_entry** auth_entry_find_first_entry(struct dawn_mac bssid_mac, struct dawn_mac client_mac);
 
 #endif