py-asyncssh: updated to 1.17.1

Release 1.17.1:
Improved construction of file paths in SFTP to better handle native Windows source paths containing backslashes or drive letters.
Improved SFTP parallel I/O for large reads and file copies to better handle the case where a read returns less data than what was requested when not at the end of the file, allowing AsyncSSH to get back the right result even if the requested block size is larger than the SFTP server can handle.
Fixed an issue where the requested SFTP block_size wasn窶冲 used in the get, copy, mget, and mcopy functions if it was larger than the default size of 16 KB.
Fixed a problem where the list of client keys provided in an SSHClientConnectionOptions object wasn窶冲 always preserved properly across the opening of multiple SSH connections.
Changed SSH agent client code to avoid printing a warning on Windows when unable to connect to the SSH agent using the default path. A warning will be printed if the agent_path or SSH_AUTH_SOCK is explicitly set, but AsyncSSH will remain quiet if no agent path is set and no SSH agent is running.
Made AsyncSSH tolerant of unexpected authentication success/failure messages sent after authentication completes. AsyncSSH previously treated this as a protocol error and dropped the connection, while most other SSH implementations ignored these messages and allowed the connection to continue.
Made AsyncSSH tolerant of SFTP status responses which are missing error message and language tag fields, improving interoperability with servers that omit these fields. When missing, AsyncSSH treats these fields as if they were set to empty strings.


(adam)