Fix "Signer 0x... is not a part of the producer set at block xxxx"

The validator set json loaded from database will have an empty map. This change will recompute the validator map based on validator set.

consensus/bor/snapshot.go

@@ -59,6 +59,8 @@ func loadSnapshot(config *params.BorConfig, sigcache *lru.ARCCache, db ethdb.Dat
 		return nil, err
 	}
 
+	snap.ValidatorSet.UpdateValidatorMap()
+
 	snap.config = config
 	snap.sigcache = sigcache
 

consensus/bor/valset/validator_set.go

@@ -628,6 +628,10 @@ func (vals *ValidatorSet) updateValidators(updates []*Validator, deletes []*Vali
 	vals.applyUpdates(updates)
 	vals.applyRemovals(deletes)
 
+	vals.UpdateValidatorMap()
+}
+
+func (vals *ValidatorSet) UpdateValidatorMap() {
 	vals.validatorsMap = make(map[common.Address]int, len(vals.Validators))
 
 	for i, val := range vals.Validators {