[Merged by Bors] - hare/oracle: reset oracle when node enters synced state

[dshulyak]

closes: #4552

the none invasive solution to mitigate problem with loading wrong activeset during sync, until we switch to graded oracle

[codecov]

Codecov Report

Merging #4936 (e551515) into develop (5d25947) will decrease coverage by 0.1%.
Report is 2 commits behind head on develop.
The diff coverage is 86.3%.

@@            Coverage Diff            @@
##           develop   #4936     +/-   ##
=========================================
- Coverage     77.1%   77.1%   -0.1%     
=========================================
  Files          263     263             
  Lines        30532   30550     +18     
=========================================
+ Hits         23558   23567      +9     
- Misses        5486    5492      +6     
- Partials      1488    1491      +3     

Files Changed	Coverage Δ
hare/eligibility/oracle.go	75.0% <85.7%> (+0.4%)	⬆️
node/node.go	63.0% <100.0%> (+<0.1%)	⬆️

... and 6 files with indirect coverage changes

[dshulyak]

bors merge

[bors]

Pull request successfully merged into develop.

Build succeeded!

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