Docker aux console is a VT100 terminal

Without that program like nano can't work.

Signed-off-by: Julien Duponchelle <julien@gns3.net>

tests/compute/docker/test_docker_vm.py

@@ -879,7 +879,7 @@ def test_start_aux(vm, loop):
 
     with asyncio_patch("asyncio.subprocess.create_subprocess_exec", return_value=MagicMock()) as mock_exec:
         loop.run_until_complete(asyncio.async(vm._start_aux()))
-    mock_exec.assert_called_with('docker', 'exec', '-i', 'e90e34656842', '/gns3/bin/busybox', 'script', '-qfc', 'while true; do /gns3/bin/busybox sh; done', '/dev/null', stderr=asyncio.subprocess.STDOUT, stdin=asyncio.subprocess.PIPE, stdout=asyncio.subprocess.PIPE)
+    mock_exec.assert_called_with('docker', 'exec', '-i', 'e90e34656842', '/gns3/bin/busybox', 'script', '-qfc', 'while true; do TERM=vt100 /gns3/bin/busybox sh; done', '/dev/null', stderr=asyncio.subprocess.STDOUT, stdin=asyncio.subprocess.PIPE, stdout=asyncio.subprocess.PIPE)
 
 
 def test_create_network_interfaces(vm):