keyfile_write

connection should verify as a valid profile according to verify.

If it does not verify, the keyfile may be incomplete and the parser may not be able to fully recreate the original profile.

Parameters:

connection	the Connection to persist to keyfile.
handler_flags	the KeyfileHandlerFlags.
handler	optional handler for events and to override the default behavior.
user_data	argument for handler.

Returns:

a new KeyFile or null on error.