ssh: workaround timeout issue with SSH_AUTH_AGAIN

When the timeout is set to 1 in LibsshSession(timeout=1), libssh
returns SSH_AUTH_AGAIN but pylibssh does not handle SSH_AUTH_AGAIN
and therefore no exception is raised here:

    with pytest.raises(SSHAuthenticationError):
        client.ssh("user1", "Wrong").connect()

Setting the timeout to 1 is necessary to allow the timeout set in

        client.host.conn.run(..., timeout=X)

to work as expected. This is due to code becoming blocked in libssh
which is C not Python, but the Python signal is delayed until we get
back to the Python code

Author: justin-stephenson

pytest_mh/conn/ssh.py

@@ -454,7 +454,7 @@ def __init__(
         # since Python will not deliver signal if the code is blocked in C
         # library. The signal is deliver only after we get back to the Python
         # code.
-        self.__conn: LibsshSession = LibsshSession(timeout=1)
+        self.__conn: LibsshSession = LibsshSession()
 
     def _read_private_key(
         self,
@@ -518,6 +518,7 @@ def connect(self) -> None:
                 port=self.port,
                 host_key_checking=False,
             )
+            self.__conn.set_ssh_options("timeout", 1)
         except LibsshSessionException as e:
             raise SSHAuthenticationError(self.host, self.port, self.user, e.message)