Add a new password policy for root users to isolate them from changes to the
default policy and to make it more obvious that root users are subject to
password policy enforcement.  The new password policy is the same as the
default policy with the following exceptions:

- The default password storage scheme has been changed from SSHA to SSHA512
- There is no default password generator
- Password changes require that the current password be provided

OpenDS Issue Number:  676