MultiMap migration issue
Solves problem with QueryBuilder and key

When a key is selected on the querybuilder, it isn't 'unset'. Meaning that all
gets are done on the key, not on the value. This commit fixes that problem
Merge branch 'maintenance-3.x' of github.com:hazelcast/hazelcast into fix/3.x/multi-map-migration
Merge pull request #1029 from pveentjer/fix/maintenance-3.x/querybuilder-key

Solves problem with QueryBuilder and key
small fix for backward compatibility
Merge pull request #1018 from gurbuzali/fix/3.x/multi-map-migration

MultiMap migration issue
retryable requests continue endlessly even there is no cluster
Small refactor in event service.
Merge pull request #1035 from gurbuzali/fix/3.x/retryable-request

retryable requests continue endlessly even there is no cluster
null object near-caching
small fix
Merge pull request #1036 from gurbuzali/fix/3.x/near-cache

null object near-caching
Fixes #1039
Fixed a portable serialization data race bug.
Merge pull request #1045 from ahmetmircik/maintenance-3.x

fix issue #1022
Merge pull request #1043 from mdogan/fix/3.1/hibernate

Fixes #1039
test fix: added latches to tests with entry listener