OPENDJ-1545 Remove Workflow, NetworkGroups and related attempts at building a proxy


WorkflowImpl.java: REMOVED
Moved all instance fields and methods to WorkflowTopology.
Removed the referenceCounter and related methods.
Removed all the workflow registration methods which where redundant with the workflow topology registration methods.

WorkflowTopology.java:
Moved all needed instance fields and methods here from WorkflowImpl + changed ctor.

RootDseWorkflowTopology.java, WorkflowTopologyNode.java, NetworkGroup.java, NetworkGroupTest.java:
Consequence of the changes to WorkflowImpl and WorkflowTopology.

WorkflowTopologyTest.java:
Removed testWorkflowRegistration(), consequence of removing WorkflowImpl registration methods.
Code cleanup.
Javadoc cleanup.


BindOperationBasis.java:
Since there is only one type of network group, it can now directly use NetworkGroup.getWorkflowCandidate().

DirectoryServer.java:
Moved NetworkGroup registration inside createWorkflow().
Inlined createAndRegisterWorkflow().
In registerBaseDN() and deregisterBaseDN() removed null checks because the lists are never null.