Ticket 47593 - Update plugin API for OTP plugin
Description: The upcoming OTP plugin from IPA needs a API update. Some of the
password scheme functions need to be available in the plugin API.
https://fedorahosted.org/389/ticket/47593
Reviewed by: richm(Thanks!)
(cherry picked from commit 6b83caf7167e74672c4b28e1958ddbcab7cfc2d8)