Review request: IEP-45, Improvements of node failure detection.

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Review request: IEP-45, Improvements of node failure detection.

Steshin Vladimir
     Hi, Igniters.

Everyone is welcome to review several suggestions of reducing time of
node failure detection - part of IEP-45:

1.IGNITE-13017 : Hardcoded timeout in re-marking node as alive. It can
prolong detection of node failure.

Solution: The hardcode simply removed.

  * 2.IGNITE-13012 : Confusing node ping algorithm, duplicated
    connection checking. This hinders other improvements.

Solution: Node ping interval is now based on parameters instead of
constant. Removed duplicated ping.

  * 3.IGNITE-13016 : Long detection of node failure.

Solutions: Using parameters instead of constants and hardcode. Fix of
backward connection checking.