Remove unnused import
Check consistency of counts store

- disable computation of relationship counts for (label,type,label) in PBI and CountsComputer
- fix CsvInputBatchImportIT having the same problem with relationship counts for (label,type,label)
Prevent to build up state in ConcurrentCountsTrackerState when increments have delta = 0
Added option to force surefire to produce heapdumps in case of OOM