* Recycle EntryImpl of EntryCache

* remove position import from Entry

* Use proper ref-counting semantic for Entry and removed position-impl recycling

* release data after retain into Entry + make variables final in position

* Fixed ref-counting after reading entries

* Introduce new load manager API

* Fix formatting and style issues

* Fix imports

* Add back renamed classes

* Add policies to ModularLoadManagerImpl

* Make system resource usage more influential

* Fix reflective setting of load manager in tests

* Conform with mockito syntax

* Improve formatting and design

* Revert to old simulation behavior, use reflective interface design

* Remove unnecessary async call

* Fix formatting

* Remove git merge remnant

* Refactor some classes and put loadManagerClassName in dynamic conf

* Delete LoadSimulationServer

* Clean API, share more code

* Remove redundant synchronized block, make correction to onUpdate

* Fix policy filter bug

* Remove availableActiveBrokers.get() call

* Use connection pooling

* Remove unused code

* Don't try reading the symlink and converting to absolute path

* Remove redundant and unnecessary statments

* Add test back to see if path contains /virtual/

* Replace System.out statements with log.info

* Change %s to {}

Changes includes:
  * Fixes for 64bit ledger ids
  * Fixed memory leak on read-only bookies
  * Fixed datasketches metric provider concurrency issue

* translate documents into japanese

* reference the same files under doc/images folder

* fixed typo

* delete unnecessary line

* Change the expression of a few words

* add a link to the translation in Documentation.md

reduce collection instances while generating metrics

PR from @sschepens  + tests and few fixes from @merlimat

* Fix for Infinite loop in PersistentReplicator.startProducer()

* Fix for Infinite loop in PersistentReplicator.startProducer()

Besides 500, other errors indicate that the server is having problems,
so close the connection to avoid sending requests to the same bad
server.  DefaultKeepAliveStrategy will look at the request and response
headers for other reasons to close, such as "Connection: close" headers.