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/apimachinery/pkg/util/uuid/uuid.go

@@ -17,27 +17,11 @@ limitations under the License.
 package uuid
 
 import (
-	"sync"
-
-	"github.com/pborman/uuid"
+	"github.com/google/uuid"
 
 	"k8s.io/apimachinery/pkg/types"
 )
 
-var uuidLock sync.Mutex
-var lastUUID uuid.UUID
-
 func NewUUID() types.UID {
-	uuidLock.Lock()
-	defer uuidLock.Unlock()
-	result := uuid.NewUUID()
-	// The UUID package is naive and can generate identical UUIDs if the
-	// time interval is quick enough.
-	// The UUID uses 100 ns increments so it's short enough to actively
-	// wait for a new value.
-	for uuid.Equal(lastUUID, result) == true {
-		result = uuid.NewUUID()
-	}
-	lastUUID = result
-	return types.UID(result.String())
+	return types.UID(uuid.New().String())
 }