Rename destroy to close or unload (more friendly).

tests/modules/vpcs/test_vpcs_vm.py

@@ -186,12 +186,12 @@ def test_change_script_file(vm, tmpdir):
     assert vm.script_file == path
 
 
-def test_destroy(vm, port_manager):
+def test_close(vm, port_manager):
     with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM._check_requirements", return_value=True):
         with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()):
             vm.start()
             port = vm.console
-            vm.destroy()
+            vm.close()
             # Raise an exception if the port is not free
             port_manager.reserve_console_port(port)
             assert vm.is_running() is False