BUG/MINOR: lua: Post init register function are not executed beyond the first one

Just because if the first init is a success we return success in place
of continuing the loop.

This patch could be backported until 1.8

src/hlua.c

@@ -8128,7 +8128,7 @@ int hlua_post_init()
 		switch (ret) {
 		case HLUA_E_OK:
 			lua_pop(gL.T, -1);
-			return 1;
+			break;
 		case HLUA_E_AGAIN:
 			ha_alert("Lua init: yield not allowed.\n");
 			return 0;