Import internal/test in all packages with tests

This allows people to run go test ./... -update, without this
in order to do a mass update of golden files you need to run the
update against individual packages which is a huge pain.

Author: carolynvs-msft

gps/paths/paths_test.go

@@ -4,7 +4,11 @@
 
 package paths
 
-import "testing"
+import (
+	"testing"
+
+	_ "github.com/golang/dep/internal/test" // DO NOT REMOVE, allows go test ./... -update to work
+)
 
 func TestIsStandardImportPath(t *testing.T) {
 	fix := []struct {

gps/pkgtree/pkgtree_test.go

@@ -20,6 +20,7 @@ import (
 
 	"github.com/golang/dep/gps/paths"
 	"github.com/golang/dep/internal/fs"
+	_ "github.com/golang/dep/internal/test" // DO NOT REMOVE, allows go test ./... -update to work
 )
 
 // PackageTree.ToReachMap() uses an easily separable algorithm, wmToReach(),

internal/feedback/feedback_test.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 
 	"github.com/golang/dep/gps"
+	_ "github.com/golang/dep/internal/test" // DO NOT REMOVE, allows go test ./... -update to work
 )
 
 func TestFeedback_Constraint(t *testing.T) {