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/istio.io/gogo-genproto/googleapis/google/api/annotations.pb.go

@@ -0,0 +1,56 @@
+// Code generated by protoc-gen-gogo. DO NOT EDIT.
+// source: google/api/annotations.proto
+
+package google_api
+
+import (
+	fmt "fmt"
+	proto "github.com/gogo/protobuf/proto"
+	descriptor "github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.GoGoProtoPackageIsVersion3 // please upgrade the proto package
+
+var E_Http = &proto.ExtensionDesc{
+	ExtendedType:  (*descriptor.MethodOptions)(nil),
+	ExtensionType: (*HttpRule)(nil),
+	Field:         72295728,
+	Name:          "google.api.http",
+	Tag:           "bytes,72295728,opt,name=http",
+	Filename:      "google/api/annotations.proto",
+}
+
+func init() {
+	proto.RegisterExtension(E_Http)
+}
+
+func init() { proto.RegisterFile("google/api/annotations.proto", fileDescriptor_c591c5aa9fb79aab) }
+
+var fileDescriptor_c591c5aa9fb79aab = []byte{
+	// 232 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x92, 0x49, 0xcf, 0xcf, 0x4f,
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+	0xb9, 0x48, 0x86, 0x3a, 0x09, 0x38, 0x22, 0xbc, 0x1a, 0x00, 0x72, 0x4d, 0x00, 0xe3, 0x22, 0x26,
+	0x16, 0x77, 0xc7, 0x00, 0xcf, 0x24, 0x36, 0xb0, 0xeb, 0x8c, 0x01, 0x01, 0x00, 0x00, 0xff, 0xff,
+	0x5b, 0x05, 0x38, 0x7d, 0x19, 0x01, 0x00, 0x00,
+}