Xcm Emulator: prepare XCMP on init (#2711)

* std for pallet-glutton

* fix xcm-emulator init

* headers for it tests

cumulus/parachains/integration-tests/emulated/assets/asset-hub-westend/src/tests/mod.rs

@@ -1,3 +1,19 @@
+// Copyright Parity Technologies (UK) Ltd.
+// This file is part of Cumulus.
+
+// Cumulus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Cumulus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Cumulus.  If not, see <http://www.gnu.org/licenses/>.
+
 mod reserve_transfer;
 mod teleport;
 mod transact;