[issue821862] ftplib: Strict RFC 959 (telnet in command channel)

[Oleg Broytmann]

Oleg Broytmann <phd at phd.pp.ru> added the comment:

> Other than IAC what other chars need to be doubled?

Only IAC must be doubled. Also there have to be a special prefix for urgent (out-of-bound) commands (ABORt); I didn't implement that.

> As an alternative to a brand new TelnetFTP class this can be implemented as a FTP class attribute ("strict_telnet" maybe) defaulting to True.

See the first patch. Default value is False to preserve backward compatibility.

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