Disallow export of project with VirtualBox linked clone

Fix https://github.com/GNS3/gns3-gui/issues/1824

tests/controller/test_export_project.py

@@ -190,9 +190,9 @@ def test_export_disallow_some_type(tmpdir, project, async_run):
     topology = {
         "topology": {
             "nodes": [
-                    {
-                        "node_type": "virtualbox"
-                    }
+                {
+                    "node_type": "cloud"
+                }
             ]
         }
     }
@@ -204,6 +204,24 @@ def test_export_disallow_some_type(tmpdir, project, async_run):
         z = async_run(export_project(project, str(tmpdir)))
     z = async_run(export_project(project, str(tmpdir), allow_all_nodes=True))
 
+    # VirtualBox is always disallowed
+    topology = {
+        "topology": {
+            "nodes": [
+                {
+                    "node_type": "virtualbox",
+                    "properties": {
+                        "linked_clone": True
+                    }
+                }
+            ]
+        }
+    }
+    with open(os.path.join(path, "test.gns3"), 'w+') as f:
+        json.dump(topology, f)
+    with pytest.raises(aiohttp.web.HTTPConflict):
+        z = async_run(export_project(project, str(tmpdir), allow_all_nodes=True))
+
 
 def test_export_fix_path(tmpdir, project, async_run):
     """

tests/controller/test_project.py

@@ -427,7 +427,7 @@ def test_duplicate(project, async_run, controller):
     remote_vpcs = async_run(project.add_node(compute, "test", None, node_type="vpcs", properties={"startup_config": "test.cfg"}))
 
     # We allow node not allowed for standard import / export
-    remote_virtualbox = async_run(project.add_node(compute, "test", None, node_type="virtualbox", properties={"startup_config": "test.cfg"}))
+    remote_virtualbox = async_run(project.add_node(compute, "test", None, node_type="vmware", properties={"startup_config": "test.cfg"}))
 
     new_project = async_run(project.duplicate(name="Hello"))
     assert new_project.id != project.id