Add a MustNamespace that panics if the namespace wasn't valid

filter/featureBreaker/gi.go

Index: filter/featureBreaker/gi.go
diff --git a/filter/featureBreaker/gi.go b/filter/featureBreaker/gi.go
index b051b6bbdf6752da5e44d7311de7546fee19ed11..6dc458cb618fe7ec28c719b7832d174a672b22c5 100644
--- a/filter/featureBreaker/gi.go
+++ b/filter/featureBreaker/gi.go
@@ -42,6 +42,14 @@ func (g *infoState) Namespace(namespace string) (ret context.Context, err error)
 	return
 }
 
+func (g *infoState) MustNamespace(namespace string) context.Context {
+	ret, err := g.Namespace(namespace)
+	if err != nil {
+		panic(err)
+	}
+	return ret
+}
+
 func (g *infoState) AccessToken(scopes ...string) (token string, expiry time.Time, err error) {
 	err = g.run(func() (err error) {
 		token, expiry, err = g.Interface.AccessToken(scopes...)