Improve test speed by using an ImpermanentGraphDatabase
Cancel index sampling when index is dropped
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
Merge pull request #3457 from davidegrohmann/2.2-consistency-check-counts

Check consistency of counts store
Adds class javadoc to TaskControl and associates
Merge pull request #3464 from davidegrohmann/2.2-sampling-index-drop

Cancel index sampling when the index is dropped
Refactored test code
stuff was changed
WIP
Started improving test framework for multiple-relationship path matches
Updated expression selectivity estimator to ha