LMS-1966 Finished refactoring, added test.

...systemsx/cisd/etlserver/DataSetRegistrationAlgorithm.java

...sx/cisd/etlserver/DataSetRegistrationAlgorithmRunner.java

...ch/systemsx/cisd/etlserver/IExtensibleDataSetHandler.java

...ch/systemsx/cisd/etlserver/TransferredDataSetHandler.java

...ransferredDataSetHandlerDataSetRegistrationAlgorithm.java

...ch/systemsx/cisd/etlserver/api/v1/PutDataSetExecutor.java

...erver/entityregistration/SampleAndDataSetRegistrator.java

...emsx/cisd/etlserver/DataSetRegistrationAlgorithmTest.java

...registration/SampleAndDatasetRegistrationHandlerTest.java