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/generator/generator.go

@@ -31,6 +31,8 @@ type Package interface {
 	Name() string
 	// Path returns the package import path.
 	Path() string
+	// SourcePath returns the location of the package on disk.
+	SourcePath() string
 
 	// Filter should return true if this package cares about this type.
 	// Otherwise, this type will be omitted from the type ordering for
@@ -50,14 +52,16 @@ type Package interface {
 }
 
 type File struct {
-	Name        string
-	FileType    string
-	PackageName string
-	Header      []byte
-	Imports     map[string]struct{}
-	Vars        bytes.Buffer
-	Consts      bytes.Buffer
-	Body        bytes.Buffer
+	Name              string
+	FileType          string
+	PackageName       string
+	Header            []byte
+	PackagePath       string
+	PackageSourcePath string
+	Imports           map[string]struct{}
+	Vars              bytes.Buffer
+	Consts            bytes.Buffer
+	Body              bytes.Buffer
 }
 
 type FileType interface {
@@ -156,6 +160,12 @@ type Context struct {
 	// All the types, in case you want to look up something.
 	Universe types.Universe
 
+	// Incoming imports, i.e. packages importing the given package.
+	incomingImports map[string][]string
+
+	// Incoming transitive imports, i.e. the transitive closure of IncomingImports
+	incomingTransitiveImports map[string][]string
+
 	// All the user-specified packages.  This is after recursive expansion.
 	Inputs []string
 
@@ -203,11 +213,36 @@ func NewContext(b *parser.Builder, nameSystems namer.NameSystems, canonicalOrder
 	return c, nil
 }
 
+// IncomingImports returns the incoming imports for each package. The map is lazily computed.
+func (ctxt *Context) IncomingImports() map[string][]string {
+	if ctxt.incomingImports == nil {
+		incoming := map[string][]string{}
+		for _, pkg := range ctxt.Universe {
+			for imp := range pkg.Imports {
+				incoming[imp] = append(incoming[imp], pkg.Path)
+			}
+		}
+		ctxt.incomingImports = incoming
+	}
+	return ctxt.incomingImports
+}
+
+// TransitiveIncomingImports returns the transitive closure of the incoming imports for each package.
+// The map is lazily computed.
+func (ctxt *Context) TransitiveIncomingImports() map[string][]string {
+	if ctxt.incomingTransitiveImports == nil {
+		ctxt.incomingTransitiveImports = transitiveClosure(ctxt.IncomingImports())
+	}
+	return ctxt.incomingTransitiveImports
+}
+
 // AddDir adds a Go package to the context. The specified path must be a single
 // go package import path.  GOPATH, GOROOT, and the location of your go binary
 // (`which go`) will all be searched, in the normal Go fashion.
 // Deprecated. Please use AddDirectory.
 func (ctxt *Context) AddDir(path string) error {
+	ctxt.incomingImports = nil
+	ctxt.incomingTransitiveImports = nil
 	return ctxt.builder.AddDirTo(path, &ctxt.Universe)
 }
 
@@ -215,5 +250,7 @@ func (ctxt *Context) AddDir(path string) error {
 // single go package import path.  GOPATH, GOROOT, and the location of your go
 // binary (`which go`) will all be searched, in the normal Go fashion.
 func (ctxt *Context) AddDirectory(path string) (*types.Package, error) {
+	ctxt.incomingImports = nil
+	ctxt.incomingTransitiveImports = nil
 	return ctxt.builder.AddDirectoryTo(path, &ctxt.Universe)
 }