Ticket 147 - Internal Password Policy usage very inefficient
Bug Description: When updating a userpassword, the passwordPolicy struct is allocated & freed 5 to 7 times.
Fix Description: Store the passwordPolicy struct in the pblock, and when we try and create a new policy struct,
return the one in the pblock.
https://fedorahosted.org/389/ticket/147
Reviewed by: richm(Thanks!)