Add asynchronous sample configuration and move the existing configuration to a etc-opendj2postgresql subdirectory

- moving the passwordhk.pl file from misc/ to bin/ (references #591)

- adding script for password change
(typical use is for "password filter", a hook intercepting password change on
windows environment)
It is able to compute SSHA and AES passwords derived from a cleartext one, and
to push the results to a ldap directory.

- correction of bug :
  replacement of pivot attributes in destination does not work when pivots is not in fetched source attributes in async
  (references #581)

 - correction of the getFullDistinguishedName method (Reference #572) :
   * getFullDistinguishedName becomes deprecated
   * getFullDistinguishedName is now functionnal (it calls getMainIdentifier())