LMS-1584 Added close method to IMigrator interface. Renamed CSV* classes to Csv*

...ce/java/ch/systemsx/cisd/etlserver/plugins/IMigrator.java

...isd/openbis/dss/etl/bdsmigration/AbstractBDSMigrator.java

...nbis/dss/etl/bdsmigration/BDSImagingDatabaseMigrator.java

...sd/openbis/dss/etl/bdsmigration/BDSImagingDbUploader.java

.../dss/etl/featurevector/AbstractFeatureVectorMigrator.java

...enbis/dss/etl/featurevector/CsvFeatureVectorMigrator.java

...is/dss/etl/featurevector/CsvToCanonicalFeatureVector.java

.../dss/etl/featurevector/FeatureVectorStorageProcessor.java

...ss/etl/featurevector/CsvToCanonicalFeatureVectorTest.java