use istio client-go library instead of knative (#1661)

use istio client-go library instead of knative
bump kubernetes dependency version
change code coverage to codecov

vendor/k8s.io/gengo/args/args.go

@@ -74,6 +74,9 @@ type GeneratorArgs struct {
 	// If true, only verify, don't write anything.
 	VerifyOnly bool
 
+	// If true, include *_test.go files
+	IncludeTestFiles bool
+
 	// GeneratedBuildTag is the tag used to identify code generated by execution
 	// of this type. Each generator should use a different tag, and different
 	// groups of generators (external API that depends on Kube generations) should
@@ -127,6 +130,10 @@ func (g *GeneratorArgs) LoadGoBoilerplate() ([]byte, error) {
 // directories.
 func (g *GeneratorArgs) NewBuilder() (*parser.Builder, error) {
 	b := parser.New()
+
+	// flag for including *_test.go
+	b.IncludeTestFiles = g.IncludeTestFiles
+
 	// Ignore all auto-generated files.
 	b.AddBuildTags(g.GeneratedBuildTag)
 
@@ -152,6 +159,9 @@ func (g *GeneratorArgs) InputIncludes(p *types.Package) bool {
 		if strings.HasSuffix(d, "...") {
 			d = strings.TrimSuffix(d, "...")
 		}
+		if strings.HasPrefix(d, "./vendor/") {
+			d = strings.TrimPrefix(d, "./vendor/")
+		}
 		if strings.HasPrefix(p.Path, d) {
 			return true
 		}
@@ -184,6 +194,9 @@ func (g *GeneratorArgs) Execute(nameSystems namer.NameSystems, defaultSystem str
 		return fmt.Errorf("Failed making a parser: %v", err)
 	}
 
+	// pass through the flag on whether to include *_test.go files
+	b.IncludeTestFiles = g.IncludeTestFiles
+
 	c, err := generator.NewContext(b, nameSystems, defaultSystem)
 	if err != nil {
 		return fmt.Errorf("Failed making a context: %v", err)