FTP: Fix SFTP keyfile authentication when no password is provided #2579
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Previously it would always assume a single specific keyfile format (
OpenSSHKeyFile
a.k.a. the "old" OpenSSH keyfile format) which obviously doesn't always work. But it only did the wrong thing when no password was provided for probably historic reasons. (Downstream I'm currently working around this issue by providing a wrong password.) Now we just useauthPublickey()
from the other branch which does the same but correctly and in addition we can remove some duplicate code.