IGNITE-6612 is ready for review (Wrap ack methods in their own class)

[Ivan Fedotov]

Hi, Igniters!
I've prepared PR [1] for the issue IGNITE-6612 "Wrap ack methods in their
own class" [2] . TeamCity tests look good [3]. Could someone review it?
Thanks in advance!
[1]https://github.com/apache/ignite/pull/3046
[2]https://issues.apache.org/jira/browse/IGNITE-6612
[3]
https://ci.ignite.apache.org/project.html?projectId=Ignite20Tests&branch_Ignite20Tests=pull%2F3046%2Fhead
--
Ivan Fedotov.

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