add encoding config in FtpHook

[chuancyzhang]

The default ftplib package in FTP Hook is latin-1 encoding. If you encounter Chinese or other non-English languages, you will encounter garbled characters if you use list_directory and other methods, so you can add a configuration item to change the encoding in FTP Hook.

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[subkanthi]

is there a reason this defaults to latin-1 and not utf-8?

[chuancyzhang]

yes

[uranusjr]

What is the current behaviour? I am not familiar with FTP, is “server default” a thing? If there is, we should probably do something like

try:
    self.conn.encoding = params.extra_dejson["encoding"]
except KeyError:
    pass

[chuancyzhang]

conn.encoding is default config. I used if to judge whether encoding is in extra_dejson, not try

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