Stopped working on IGNITE-1032 (discovery.tcp.ServerImpl.RingMessageWorker#processStatusCheckMessage should not block)

[Denis Magda]

Hi,

More info on the bug can be found here:
https://issues.apache.org/jira/browse/IGNITE-1032
The fix resolves the situation when RingMessageWorker may be blocked 
while trying to respond to a node that possibly left the topology earlier.

--
Denis