parameters: move the `confirm` kwarg to Param
Whether a parameter is treated like password is determined by the
`password` class attribute defined in the Param class. Whether the CLI will
asks for confirmation of a password parameter depends on the value of the
`confirm` kwarg of the Password class.
Move the `confirm` kwarg from the Password class to the Param class, so
that it can be used by any Param subclass which has the `password` class
attribute set to True.
This fixes confirmation of the --key option of otptoken-add, which is a
Bytes subclass with `password` set to True.
https://fedorahosted.org/freeipa/ticket/6174
Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: David Kupka <dkupka@redhat.com>