LMS-2077 MockLogger moved to project 'common'. DeletionCommand respects locked data sets.

...Test/java/ch/systemsx/cisd/common/logging/MockLogger.java

.../openbis/dss/generic/server/DataSetDirectoryProvider.java

...emsx/cisd/openbis/dss/generic/server/DeletionCommand.java

...openbis/dss/generic/shared/IDataSetDirectoryProvider.java

...openbis/dss/generic/shared/utils/SegmentedStoreUtils.java

...cisd/openbis/dss/generic/server/UploadingCommandTest.java

...server/plugins/standard/MockDataSetDirectoryProvider.java

...bis/dss/generic/shared/utils/SegmentedStoreUtilsTest.java