ISPN-3318 Add embedded rolling upgrade documentation

* Command-Line Interface cache loader will be documented in a
separate commit.
ISPN-3400 Update JCache documentation
ISPN-3534 Investigate performance regressions in Infinispan 6.0.0

Set the default UFC.max_credits and MFC.max_credits to 2M, which is also
the JGroups default.
ISPN-3708 Allow setting a default cache for the Protocol servers
Minor documentation corrections
ISPN-3615 Add user documentation for Infinispan's new query DSL
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