bump(github.com/goraft/raft): 6bf34b9

Move from coreos/raft to goraft/raft and update to latest.

third_party/github.com/goraft/raft/statemachine_test.go

@@ -0,0 +1,19 @@
+package raft
+
+import (
+	"github.com/stretchr/testify/mock"
+)
+
+type mockStateMachine struct {
+	mock.Mock
+}
+
+func (m *mockStateMachine) Save() ([]byte, error) {
+	args := m.Called()
+	return args.Get(0).([]byte), args.Error(1)
+}
+
+func (m *mockStateMachine) Recovery(b []byte) error {
+	args := m.Called(b)
+	return args.Error(0)
+}