Cpp thin client transactions support ready for review.

[Zhenya Stanilovsky]

Thanks Ivan Daschinsky for review, does anyone more who could check it ? 
 
thanks !
>Igniters, seems i complete with transactions in thin cpp client
>implementation [1], part of iep-34 [2].
>Can anyone review my decision ?
>Failed test seems not mine, looks like after fresh master rebase it will
>gone.
>
>[1]  https://issues.apache.org/jira/browse/IGNITE-13308
>[2]
>https://cwiki.apache.org/confluence/display/IGNITE/IEP-34+Thin+client%3A+transactions+support
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