IGNITE-4908: Ignite.reentrantLock looks much slower than IgniteCache.lock

[Александр Меньшиков]

Hi!

I need advice about the task:
https://issues.apache.org/jira/browse/IGNITE-4908

Better to read about the problem in Jira because it needs a context (2 last
messages).

The question in the last message. Please take a look.