Limit announced version of FTP minipot

This issue is based on #46 (closed). I wanted to split it according to given minipot type.

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marked this issue as related to #46 (closed)

changed the description

As I wrote in #46 (comment 195060). Change from vsFTPd to PureFTP is not that easy. To do the change I would need to exploit some PureFTP instance.

But as @vmyslivec said vsFTPd version 3.0.3 is there for 5 years so it can probably wait.

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