fix lint

Author: tim-barry

cmd/bootstrap/cmd/rootblock.go

@@ -12,7 +12,6 @@ import (
 
 	"github.com/onflow/flow-go/cmd"
 	"github.com/onflow/flow-go/cmd/bootstrap/run"
-	"github.com/onflow/flow-go/cmd/bootstrap/utils"
 	"github.com/onflow/flow-go/cmd/util/cmd/common"
 	model "github.com/onflow/flow-go/model/bootstrap"
 	"github.com/onflow/flow-go/model/dkg"