add dvm && dpp admin control

contracts/DODOVendingMachine/intf/IDVMAdmin.sol

@@ -0,0 +1,13 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+interface IDVMAdmin {
+    function init(address owner, address _dvm) external;
+}