Ignores -y option on fingerprint verification

[cyberduck]

224035d created the issue

Current behavior:

Gerhards-MacBook-Air:Projects gpoul$ duck -y --list sftp://sftp.dc2.gpaas.net/
Opening SFTP connection to sftp.dc2.gpaas.net…
Unknown fingerprint. The fingerprint for the RSA key sent by the server is 35:e0:5a:a9:54:12:55:6b:ce:41:8c:c1:9e:35:1d:f6. Continue? (y/n): ^C

Expected behavior: When -y is supplied, don't ask y/n, but assume yes.

[cyberduck]

@dkocher commented

In e437512.