Import tool recognizes 'TAB' delimiter as tab character
Import tool prints errors to System.err
Merge pull request #3547 from tinwelint/2.2-import-tool-print-error

Import tool prints errors to System.err
Merge pull request #3545 from tinwelint/2.2-import-tool-tab-delimiter

Import tool recognizes 'TAB' delimiter as tab character
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and fixed outdated tests: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