Method sinkConfInit initializes this instance as a sink.
This method maybe called more than once if this Tap instance is used outside the scope of a {@link cascading.flow.Flow}instance or if it participates in multiple times in a given Flow or across different Flows in a {@link cascading.cascade.Cascade}.
Note this method will be called in context of this Tap being used as a traditional 'sink' and as a 'trap'.
In the context of a Flow, it will be called after {@link cascading.flow.FlowListener#onStarting(cascading.flow.Flow)}
Note that no resources or services should be modified by this method. If this Tap instance returns true for {@link #isReplace()}, then {@link #deleteResource(Object)} will be called by the parent Flow.
@param flowProcess of type FlowProcess
@param conf of type Config