Ticket 47371 - Some updates of "passwordgraceusertime" are useless when updating "userpassword"
Bug Description: "passwordgraceusertime" is always reset to "0" after a password change.
Even if the the current value is "0".
Fix Description: Only reset the value to "0" if the current value is not "0".
https://fedorahosted.org/389/ticket/47371
Reveiwed by: Noriko(Thanks!)