Use enum to define IKE version on peer_cfg_t.

Replaced all those magic numbers.

src/libcharon/plugins/sql/sql_config.c

@@ -368,7 +368,7 @@ static peer_cfg_t *build_peer_cfg(private_sql_config_t *this, enumerator_t *e,
 		if (ike)
 		{
 			peer_cfg = peer_cfg_create(
-					name, 2, ike, cert_policy, uniqueid,
+					name, IKEV2, ike, cert_policy, uniqueid,
 					keyingtries, rekeytime, reauthtime, jitter, overtime,
 					mobike,	dpd_delay, vip, pool,
 					mediation, mediated_cfg, peer_id);