Fix OPENDJ-233: Integrate Samba password sync plugin into OpenDJ (contributed by Profiq S.R.O)

Many thanks to Nemanja Lukic and his colleagues at Profiq S.R.O for this kind contribution.

The contribution has been modified as follows:

*) integrate as core feature of OpenDJ, not extension
*) rename package names accordingly
*) remove dependency on BouncyCastle.org MD4 implementation, by porting implementation to OpenDJ
*) re-implement setOddParity method in order to avoid potential copyright issues with existing implementations.
*) simplify configuration model and validation.

TODO:

*) support u: and dn: authid in password modify extended operation.