Stopped working on IGNITE-1100 - TcpDiscoveryMultiTreadedTest.testMultiThreaded() fails

[Denis Magda]

Subj: https://issues.apache.org/jira/browse/IGNITE-1100

The following was fixed:
- passing non verified messages to client nodes;
- bug in the code that removes disconnected nodes from a topology.

As a result now multiple client nodes may be started and stopped from
multiple threads without causing memory leaks and other failures.

--
Denis