tdeioslave/sftp: overhaul publickey auth

Several enhancements to public key authentication and some other stuff:
- Fix passphrase entry for encrypted keys (was either hanging up or
  segfaulting)
- Use scope guard idiom for cleanup calls for more reliable cleanup in
  case of errors
- Add normal prompt for public key's passphrase entry dialog
- Correctly differentiate passphrase to password when cached (yes they
  are getting cached regardless of keepPassword, at least for some
  duration of time)
- Centrilize AuthInfo initialization and some rejig of it
  kbd-interactive authentification

Signed-off-by: Alexander Golubev <fatzer2@gmail.com>

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