ticket-16 fixed/improved network off-line detection

[sergiy-skalelabs]

Improved network off-line detection.
We can expect much better performance on S-Chains with up to 5 nodes turned off.
No new tests needed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (749392d) 85.79% compared to head (186248e) 85.79%.

❗ Current head 186248e differs from pull request most recent head 6abe60b. Consider uploading reports for the commit 6abe60b to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1640   +/-   ##
========================================
  Coverage    85.79%   85.79%           
========================================
  Files           26       26           
  Lines         1464     1464           
  Branches       401      401           
========================================
  Hits          1256     1256           
  Misses          33       33           
  Partials       175      175           

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