bridge domain: fix members reordered when removing

since adding support for multicast vxlan flooding (flood class tunnel master)
correct flood functionality depends on the order of the memebers vector

solved by using vec_delete instead of vec_del1 which swaps members before deleting the last element

Change-Id: I234f218d49172b4142c567db9699a5cb274e4a66
Signed-off-by: Eyal Bari <ebari@cisco.com>
diff --git a/src/vnet/l2/l2_bd.c b/src/vnet/l2/l2_bd.c
index 22f83d0..f741b64 100644
--- a/src/vnet/l2/l2_bd.c
+++ b/src/vnet/l2/l2_bd.c
@@ -185,7 +185,7 @@
 	    else if (sw_if->flood_class == VNET_FLOOD_CLASS_TUNNEL_NORMAL)
 	      bd_config->tun_normal_count--;
 	  }
-	vec_del1 (bd_config->members, ix);
+	vec_delete (bd_config->members, 1, ix);
 	update_flood_count (bd_config);
 
 	return BD_REMOVE_ERROR_OK;