Ignores transactions w/o commit entry when migrating logs
Enables execution of IT tests in community/neo4j component

and fixed outdated tests:
- Some tests hadn't kept up with a change in exampledb.zip
- Test that exposed issue where database files were changed while
  migrating
Only deduplicate properties if there were any duplicated key tokens
Temporarily disable tests while fixing underlying problem
Merge pull request #3554 from tinwelint/2.2-migration-logs-ignore-nocommit

Enables execution of IT tests in community/neo4j component