verify epoch in dispatcher using consensus verifier

[ptrus]

No description provided.

[codecov]

Codecov Report

Merging #4677 (73dc558) into master (9f399d0) will decrease coverage by 0.54%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##           master    #4677      +/-   ##
==========================================
- Coverage   67.37%   66.83%   -0.55%     
==========================================
  Files         436      436              
  Lines       48915    48902      -13     
==========================================
- Hits        32958    32682     -276     
- Misses      11906    12168     +262     
- Partials     4051     4052       +1     

Impacted Files	Coverage Δ
go/worker/compute/executor/committee/node.go	68.70% <80.95%> (-3.52%)	⬇️
go/consensus/tendermint/roothash/roothash.go	67.97% <100.00%> (-2.01%)	⬇️
go/ias/http/http.go	20.33% <0.00%> (-44.07%)	⬇️
go/oasis-node/cmd/common/metrics/disk.go	65.51% <0.00%> (-20.69%)	⬇️
go/runtime/host/sandbox/sandbox.go	59.85% <0.00%> (-16.91%)	⬇️
.../worker/compute/executor/committee/transactions.go	68.18% <0.00%> (-13.64%)	⬇️
go/keymanager/api/policy_sgx.go	33.33% <0.00%> (-13.34%)	⬇️
go/runtime/host/multi/multi.go	70.58% <0.00%> (-8.09%)	⬇️
go/oasis-node/cmd/common/metrics/resource.go	84.00% <0.00%> (-8.00%)	⬇️
go/worker/storage/committee/utils.go	92.30% <0.00%> (-7.70%)	⬇️
... and 46 more

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