batman-adv: rename everything from *hna* into *tt* (translation table)

To be coherent, all the functions/variables/constants have been renamed
to the TranslationTable style

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index e757187..c225c3a 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -61,7 +61,7 @@
 	uint8_t  orig[6];
 	uint8_t  prev_sender[6];
 	uint8_t  ttl;
-	uint8_t  num_hna;
+	uint8_t  num_tt;
 	uint8_t  gw_flags;  /* flags related to gateway class */
 	uint8_t  align;
 } __packed;