Use apiextension v1

- upgrade from apiextension v1beta1 to v1
 - generate yaml manifest for crd intead of applying it at runtime
  - users will have to apply the manifest with kubectl
 - kg and kgctl log an error if the crd is not present
 - now validation should actually work

Signed-off-by: leonnicolas <leonloechner@gmx.de>

vendor/github.com/spf13/cobra/zsh_completions.go

@@ -70,12 +70,12 @@ func (c *Command) genZshCompletion(w io.Writer, includeDesc bool) error {
 	return err
 }
 
-func genZshComp(buf *bytes.Buffer, name string, includeDesc bool) {
+func genZshComp(buf io.StringWriter, name string, includeDesc bool) {
 	compCmd := ShellCompRequestCmd
 	if !includeDesc {
 		compCmd = ShellCompNoDescRequestCmd
 	}
-	buf.WriteString(fmt.Sprintf(`#compdef _%[1]s %[1]s
+	WriteStringAndCheck(buf, fmt.Sprintf(`#compdef _%[1]s %[1]s
 
 # zsh completion for %-36[1]s -*- shell-script -*-