Remove license headers and update imports

lib/instance-set.ts

@@ -1,22 +1,3 @@
-/**
- * Copyright 2013-2019  GenieACS Inc.
- *
- * This file is part of GenieACS.
- *
- * GenieACS is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * GenieACS 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 Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with GenieACS.  If not, see <http://www.gnu.org/licenses/>.
- */
-
 interface Instance {
   [name: string]: string;
 }