ISPN-3318 ISPN-2806 CLI cache loader and Single file store docs

* Added a section on data migration for new cache store formats.
* Added section for CLI cache loader.
* Rewrote file store section.
'Release Script: update versions for 6.0.1-SNAPSHOT'
ISPN-3727 intermittent test failure AsyncReplExtendedStatisticTest.testReplaceWithOldVal

* temporerly  disable test
ISPN-3734 Better trace logging with entry versions