Merge bitcoin/bitcoin#25950: test: fix test abort for high timeout values (and --timeout-factor 0)

14302a4802e2dbb41f5189de88f99ddd5dda7736 test: fix test abort for high timeout values (and `--timeout-factor 0`) (Sebastian Falbesoner)

Pull request description:

  On master, the functional tests's option `--timeout-factor 0` (which according to the test docs and parameter description should disable the RPC timeouts) currently fails, same as high values like `--timeout-factor 999999`:
  ```
  $ ./test/functional/wallet_basic.py --timeout-factor 0
  2022-08-29T01:26:39.561000Z TestFramework (INFO): Initializing test directory /tmp/bitcoin_func_test_f24yxzp5
  2022-08-29T01:26:40.262000Z TestFramework (ERROR): Assertion failed
  Traceback (most recent call last):
    File "/home/honey/bitcoin/test/functional/test_framework/test_framework.py", line 549, in start_nodes
      node.wait_for_rpc_connection()
    File "/home/honey/bitcoin/test/functional/test_framework/test_node.py", line 234, in wait_for_rpc_connection
      rpc.getblockcount()
    File "/home/honey/bitcoin/test/functional/test_framework/coverage.py", line 49, in __call__
      return_val = self.auth_service_proxy_instance.__call__(*args, **kwargs)
    File "/home/honey/bitcoin/test/functional/test_framework/authproxy.py", line 142, in __call__
      response, status = self._request('POST', self.__url.path, postdata.encode('utf-8'))
    File "/home/honey/bitcoin/test/functional/test_framework/authproxy.py", line 107, in _request
      self.__conn.request(method, path, postdata, headers)
    File "/usr/local/lib/python3.9/http/client.py", line 1285, in request
      self._send_request(method, url, body, headers, encode_chunked)
    File "/usr/local/lib/python3.9/http/client.py", line 1331, in _send_request
      self.endheaders(body, encode_chunked=encode_chunked)
    File "/usr/local/lib/python3.9/http/client.py", line 1280, in endheaders
      self._send_output(message_body, encode_chunked=encode_chunked)
    File "/usr/local/lib/python3.9/http/client.py", line 1040, in _send_output
      self.send(msg)
    File "/usr/local/lib/python3.9/http/client.py", line 980, in send
      self.connect()
    File "/usr/local/lib/python3.9/http/client.py", line 946, in connect
      self.sock = self._create_connection(
    File "/usr/local/lib/python3.9/socket.py", line 844, in create_connection
      raise err
    File "/usr/local/lib/python3.9/socket.py", line 832, in create_connection
      sock.connect(sa)
  OSError: [Errno 22] Invalid argument
  ```
  This is caused by a high timeout value that Python's HTTP(S) client library can't cope with. Fix this by clamping down the connection's set timeout value in AuthProxy. The change can easily be tested by running an arbitrary test with `--timeout-factor 0` on master (should fail), on this PR (should pass) and on this PR with the clamping value increased by 1 (should fail).

  // EDIT: The behaviour was observed on OpenBSD 7.1 and Python 3.9.12.

ACKs for top commit:
  MarcoFalke:
    lgtm ACK 14302a4802e2dbb41f5189de88f99ddd5dda7736

Tree-SHA512: 6469e8ac699f1bb7dea11d5fb8b3ae54d895bb908570587c5631144cd41fe980ca0b1e6d0b7bfa07983307cba15fb26ae92e6766375672bf5be838d8e5422dbc

test/functional/test_framework/authproxy.py

@@ -78,7 +78,10 @@ class AuthServiceProxy():
         passwd = None if self.__url.password is None else self.__url.password.encode('utf8')
         authpair = user + b':' + passwd
         self.__auth_header = b'Basic ' + base64.b64encode(authpair)
-        self.timeout = timeout
+        # clamp the socket timeout, since larger values can cause an
+        # "Invalid argument" exception in Python's HTTP(S) client
+        # library on some operating systems (e.g. OpenBSD, FreeBSD)
+        self.timeout = min(timeout, 2147483)
         self._set_conn(connection)
 
     def __getattr__(self, name):