Support for sendings settings for the GNS3VM from the GUI

Ref https://github.com/GNS3/gns3-gui/issues/1441

gns3server/controller/gns3vm/gns3_vm_error.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2016 GNS3 Technologies Inc.
+#
+# This program 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.
+#
+# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+class GNS3VMError(Exception):
+
+    def __init__(self, message):
+        super().__init__(message)
+        self._message = message
+
+    def __repr__(self):
+        return self._message
+
+    def __str__(self):
+        return self._message