Renamed pwmd_password_fn to pwmd_passphrase_cb_t. This also changes the
prototype to return a gpg_error_t and have the new 2nd parameter be set
to the passphrase. Returning non-zero will cause the command to fail.
Renamed pwmd_status_fn to pwmd_status_cb_t.
Renamed pwmd_inquire_fn to pwmd_inquire_cb_t.
Renamed PWMD_OPTION_PASSWORD to PWMD_OPTION_PASSPHRASE.
Renamed PWMD_OPTION_PASSWORD_FUNC to PWMD_OPTION_PASSPHRASE_CB.
Renamed PWMD_OPTION_PASSWORD_DATA to PWMD_OPTION_PASSPHRASE_DATA.
Renamed PWMD_OPTION_STATUS_FUNC to PWMD_OPTION_STATUS_CB.