os.linux: Show latency data providers per priority only when applicable
For that, add check for SWSLatencyAnalysis instance before returning the data provider descriptor, in case of the SWS latency statistics per priority and thread.
Let method getDataProviderDescriptor(analysis) of abstract class AbstractSegmentStoreStatisticsDataProviderFactory return an IDataProviderDescriptor instead DataProviderDescriptor.Builder, and update all extending classes of this abstract class.