message: If namespace dropdown is initialized to 'all', highlight it.
diff: @@ -168,7 +168,7 @@ const NamespaceDropdown = connect(() => ({activeNamespace: getActiveNamespace()}
  };
  return <div className="co-namespace-selector">
  - Namespace: <Dropdown className="co-namespace-selector__dropdown" noButton={true} items={items} title={title} onChange={onChange} selectedKey={activeNamespace} />
  + Namespace: <Dropdown className="co-namespace-selector__dropdown" noButton={true} items={items} title={title} onChange={onChange} selectedKey={activeNamespace || allNamespacesKey} />
  </div>;
  });
  