SFTP: You will need to explicitly load HostKeys

[Neocky]

Describe the bug When using SFTP there always comes the no "HostKeys loaded" issue. SFTP works nontheless.

Error:

UserWarning: Failed to load HostKeys from C:\Users\USER\.ssh\known_hosts.  You will need to explicitly load HostKeys (cnopts.hostkeys.load(filename)) or disableHostKey checking (cnopts.hostkeys = None).
  warnings.warn(wmsg, UserWarning)

Setting HostKeys = None won't work.