Update vendor dir and Godeps.json with new Godep

vendor/github.com/mesos/mesos-go/auth/sasl/mock/mock.go

@@ -1,17 +0,0 @@
-package mock
-
-import (
-	"github.com/gogo/protobuf/proto"
-	mock_messenger "github.com/mesos/mesos-go/messenger/mock"
-	"github.com/mesos/mesos-go/upid"
-	"github.com/stretchr/testify/mock"
-	"golang.org/x/net/context"
-)
-
-type Transport struct {
-	*mock_messenger.Messenger
-}
-
-func (m *Transport) Send(ctx context.Context, upid *upid.UPID, msg proto.Message) error {
-	return m.Called(mock.Anything, upid, msg).Error(0)
-}