[SCTP]: Update AUTH structures to match declarations in draft-16.

The new SCTP socket api (draft 16) updates the AUTH API structures.
We never exported these since we knew they would change.
Update the rest to match the draft.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index 8bb79f2..675a5c3 100644
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -838,11 +838,11 @@
 	}
 
 	/* Create a new key data based on the info passed in */
-	key = sctp_auth_create_key(auth_key->sca_keylen, GFP_KERNEL);
+	key = sctp_auth_create_key(auth_key->sca_keylength, GFP_KERNEL);
 	if (!key)
 		goto nomem;
 
-	memcpy(key->data, &auth_key->sca_key[0], auth_key->sca_keylen);
+	memcpy(key->data, &auth_key->sca_key[0], auth_key->sca_keylength);
 
 	/* If we are replacing, remove the old keys data from the
 	 * key id.  If we are adding new key id, add it to the