Mancenter RemoveLatency problem fix
Merge remote-tracking branch 'origin/3.0' into 3.0
Refactored SystemLogService. Small cleanups.
Fixed predicates concurrency bug.
Added is-map-loader, is-map-store checks.
Refactored tx commit test.
map txn bug fix: same key overrides txn op with same key but different map name
Added BaseMultiMap.
MultiMap KeyAwareTransactionLog fixed
Fixes TestNodeRegistry master selection issue.
Merge branch '3.0' of github.com:hazelcast/hazelcast into 3.0-classloader-config-not-used