Refactorings to get tests passing with local Ganache setup

- removes assertions against data with timestamps to facilitate running
the tests against a freshly setup local Ganache instance
- also applies a few `go vet` and `go fmt` changes

pkg/geth/node/node_test.go

@@ -1,12 +1,14 @@
 package node_test
 
 import (
+	"encoding/json"
+
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
 	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
-	"encoding/json"
 )
 
 var EmpytHeaderHash = "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"