Add controls to extended ops API signatures, need impl.
Update password to support optional server side generation of
new password, verification of old password, and changing of
non-bound user's passwords.
frontend to complete parsing of extended op reqdata.
Modify password extended operation to allow optional id (DN)
entry to change (not tested). Also, provide room to allow
server side password generation (not implemented). Added optional old
password field to support proxying (not implemented).
Need to implement replog() support.
user password. Likely to be modified to use bind control
instead. Use of modify deprecated in favor mechanisms that
support passwords stored externally to the directory (such
as in a SASL service).
Modified slapd extended operation infrastructure to support
backend provided extended operations.
