Selection algorithm only on consensus level

[assafmo]

Always use the consensus level (Ethereum) selection algorithm for assigning tasks.
Remove local implementation.

[codecov[bot]]

Codecov Report

Merging #261 into develop will decrease coverage by 27.62%. The diff coverage is 72.72%.

@@             Coverage Diff              @@
##           develop     #261       +/-   ##
============================================
- Coverage    78.85%   51.22%   -27.63%     
============================================
  Files          102      100        -2     
  Lines         4743     4658       -85     
============================================
- Hits          3740     2386     -1354     
- Misses        1003     2272     +1269

Impacted Files	Coverage Δ
src/ethereum/EnigmaContractReaderAPI.js	48.22% <0%> (-9.45%)	:arrow_down:
src/ethereum/EthereumVerifier.js	48.63% <96%> (-42.8%)	:arrow_down:
...worker/state_sync/receiver/StateSyncReqVerifier.js	10% <0%> (-90%)	:arrow_down:
src/common/DbUtils.js	13.79% <0%> (-82.76%)	:arrow_down:
src/db/StateCache.js	8.82% <0%> (-82.36%)	:arrow_down:
src/worker/controller/actions/HealthCheckAction.js	10.71% <0%> (-82.15%)	:arrow_down:
...er/state_sync/receiver/LocalMissingStatesResult.js	10% <0%> (-80%)	:arrow_down:
...ker/controller/actions/sync/TryReceiveAllAction.js	12.9% <0%> (-79.41%)	:arrow_down:
...ntroller/actions/ethereum/GetWorkerParamsAction.js	11.11% <0%> (-77.78%)	:arrow_down:
...rker/controller/actions/ethereum/RegisterAction.js	11.53% <0%> (-76.93%)	:arrow_down:
... and 55 more

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[assafmo]

Two integration tests are failing for some reason:

I'm trying to debug them locally with the help of @lacabra.