Fixed remote exception and added unittest to show this is already fixed

Conflicts:
	hazelcast-client/src/test/java/com/hazelcast/client/map/ClientMapLoadAllTest.java
	hazelcast/src/main/java/com/hazelcast/util/ExceptionUtil.java
Merge pull request #3036 from noctarius/github_issue_3031_maintenance

Fixed remote exception and added unittest to show this is already fixed (backport)