merge
fixes #3138 . Update istatistics after operation is run and  before response is send to client
unit test fix for #3052 and #3053
fix attempt for test testClear_withLockedKey_whenNodeTerminated
Merge pull request #3143 from serkan-ozal/fix/master/issue-3052-and-3053

unit test fix for #3052 and #3053
doc update for #2813
Merge branch 'master' of https://github.com/hazelcast/hazelcast
More improvements on Clients section
copy&paste error removed from Javadoc
Client properties added to Java Client section.
update after comments on pr
update after comments on pr .2
update after comments on pr
Merge pull request #3144 from jerrinot/paperCuts/latencyTypo

copy&paste error removed from Javadoc
checkstyle fix
fix attempt for testAtomicLongSpawnNodeInParallel
fix attempt for testListeners
added clusterWide support to isNew method
fix attempt for testManagedMultiPostregisteredExecutionCallbackCompletableFuture
Merge pull request #3137 from pveentjer/javadoc/3.x/map-merge

Javadoc improvements + minor other cleanup