go/consensus: Exclude expired nodes from validator set at genesis time

[abukosek]

Closes #3763.

[codecov]

Codecov Report

Merging #3766 (67bf14f) into master (c0493a0) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3766      +/-   ##
==========================================
+ Coverage   67.11%   67.25%   +0.13%     
==========================================
  Files         401      401              
  Lines       39994    39996       +2     
==========================================
+ Hits        26842    26898      +56     
+ Misses       9352     9316      -36     
+ Partials     3800     3782      -18     

Impacted Files	Coverage Δ
go/consensus/tendermint/api/genesis.go	73.45% <100.00%> (+0.47%)	⬆️
go/consensus/tendermint/abci/state/state.go	54.54% <0.00%> (-9.10%)	⬇️
go/worker/storage/service_external.go	48.57% <0.00%> (-5.72%)	⬇️
go/storage/api/root_cache.go	71.11% <0.00%> (-4.45%)	⬇️
...consensus/tendermint/apps/roothash/transactions.go	67.14% <0.00%> (-3.34%)	⬇️
go/worker/storage/committee/checkpoint_sync.go	71.48% <0.00%> (-2.01%)	⬇️
go/storage/api/grpc.go	65.09% <0.00%> (-1.89%)	⬇️
go/storage/database/database.go	73.39% <0.00%> (-1.84%)	⬇️
...consensus/tendermint/apps/registry/transactions.go	56.98% <0.00%> (-1.81%)	⬇️
go/consensus/tendermint/abci/state.go	71.13% <0.00%> (-1.38%)	⬇️
... and 31 more

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