Introducing TxCountsTrackingTestSupport

o  Moving PeriodicCommitAcceptanceTest to use FunSuite
Fix LoadCsvPeriodicCommitObserver must commit if updates are greater or _equal_ the batch size
Report line number information when failing during import with USING PERIODIC COMMIT LOAD CSV ...

o Some cleanup in EPB and renamed NullDecorator to NullPipeDecorator
o Introduce LoadCsvStatusWrapException
o Made sure LoadCsvPipe uses the correct external resource for loading (the one provided by the observer)
Ensure that each PeriodicCommitLoadCsvAcceptance test only turns green by exactly one way to commit

o Previously some of these tests could get green either by onNext() or onNotify() code paths which caused confusion.
  This happened due to the number of updates and the periodic commit value used and due to onNotify() using
  a batchSize * 2 safety factor
o Add UpdateCounter
Ensure that errors from server are correct when LOAD CSV adds line number information when USING PERIODIC COMMIT
Merge pull request #2058 from davidegrohmann/2.1-loadcsv-periodiccommit-reporting

Add line number information on failure when USING PERIODIC COMMIT LOAD CSV