controller-runtime currently adds the --kubeconfig flag if

pkg/client/config is imported (set up in an init() function).
The SDK's test framework also adds this flag, which will panic
if both are imported and the test framework is initialized.
This commit creates a new flag.FlagSet for the test framework
instead of using the global one.

pkg/test: use local flag.FlagSet instead of flag.CommandLine

pkg/test/main_entry.go

@@ -24,8 +24,10 @@ import (
 
 func MainEntry(m *testing.M) {
 	fopts := &frameworkOpts{}
-	fopts.addToFlagSet(flag.CommandLine)
-	flag.Parse()
+	fs := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
+	fopts.addToFlagSet(fs)
+
+	fs.Parse(os.Args[1:])
 
 	f, err := newFramework(fopts)
 	if err != nil {