Appveyor fails test_ntor.sh and test_hs_ntor.sh
``` FAIL: src/test/test_ntor.sh 2571=========================== 2572 2573Traceback (most recent call last): 2574 File "C:/projects/tor/i686-w64-mingw32/../src/test/ntor_ref.py", line 402, in <module> 2575 test_tor() 2576 File "C:/projects/tor/i686-w64-mingw32/../src/test/ntor_ref.py", line 368, in test_tor 2577 c2s_msg, c_state = tor_client1(node_id, pubkey_B) 2578 File "C:/projects/tor/i686-w64-mingw32/../src/test/ntor_ref.py", line 347, in tor_client1 2579 stdout=subprocess.PIPE) 2580 File "C:\msys64\mingw32\lib\python3.6\subprocess.py", line 709, in __init__ 2581 restore_signals, start_new_session) 2582 File "C:\msys64\mingw32\lib\python3.6\subprocess.py", line 971, in _execute_child 2583 args = list2cmdline(args) 2584 File "C:\msys64\mingw32\lib\python3.6\subprocess.py", line 461, in list2cmdline 2585 needquote = (" " in arg) or ("\t" in arg) or not arg 2586TypeError: a bytes-like object is required, not 'str' 2587OK 2588FAIL src/test/test_ntor.sh (exit status: 1) 2589 2590 FAIL: src/test/test_hs_ntor.sh 2591============================== 2592 2593DONE: python dance [b'Cc\x0e"k\'*\xc4\x8a\x18\xc2\xfcN\xac\x8e(\xaa\x14\xb1\xccqqCN"\x9f\x9b\xd5W@\x94O'] 2594Traceback (most recent call last): 2595 File "C:/projects/tor/i686-w64-mingw32/../src/test/hs_ntor_ref.py", line 424, in <module> 2596 do_little_t_tor_ntor_test() 2597 File "C:/projects/tor/i686-w64-mingw32/../src/test/hs_ntor_ref.py", line 310, in do_little_t_tor_ntor_test 2598 client_ephemeral_enc_privkey, subcredential) 2599 File "C:/projects/tor/i686-w64-mingw32/../src/test/hs_ntor_ref.py", line 248, in tor_client1 2600 stdout=subprocess.PIPE) 2601 File "C:\msys64\mingw32\lib\python3.6\subprocess.py", line 709, in __init__ 2602 restore_signals, start_new_session) 2603 File "C:\msys64\mingw32\lib\python3.6\subprocess.py", line 971, in _execute_child 2604 args = list2cmdline(args) 2605 File "C:\msys64\mingw32\lib\python3.6\subprocess.py", line 461, in list2cmdline 2606 needquote = (" " in arg) or ("\t" in arg) or not arg 2607TypeError: a bytes-like object is required, not 'str' 2608FAIL src/test/test_hs_ntor.sh (exit status: 1) 2609 2610 ```
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