JOE should support the keyboard-interactive authentication method for SFTP

Current Situation

• JOE supports use of the SFTP protocol with the authentication methods:
  • password: this method is used if the password is stored with JOE
  • publickey: this methods is used for a public/private key pair.

Desired Behavior

• In addition to the above authentication methods a user should be able to use the authentication method:
  • keyboard-interactive: this method is used if no password is stored with JOE but the user is prompted to enter a password on-the-fly.
  • The label text for "passphrase" input should explain this behavior: "Passphrase for private key or password. If left empty then the user will be prompted for keyboard input".