test: Fix race condition in OpenShift testNodeNavigation
test: Fix race condition in OpenShift testNodeNavigation

The test assumed that `#machine-troubleshoot` was immediately visible
after a failed login; but there is a "Connecting..." state in between
where the button is hidden:

```
      <h1>Connecting to the machine</h1>
      <p></p>
      <div class="blank-slate-pf-main-action">
        <button id="machine-reconnect" class="btn btn-primary btn-lg" style="display: none;">Reconnect</button>
        <button id="machine-troubleshoot" class="btn btn-primary btn-lg" style="display: none;">Troubleshoot</button>
      </div>
```

deryni/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,deryni/cockpit,moraleslazaro/cockpit,Scribery/cockpit,mareklibra/cockpit,petervo/cockpit,Scribery/cockpit,andreasn/cockpit,andreasn/cockpit,moraleslazaro/cockpit,deryni/cockpit,deryni/cockpit,martinpitt/cockpit,cockpituous/cockpit,petervo/cockpit,martinpitt/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,Scribery/cockpit,cockpit-project/cockpit,petervo/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,deryni/cockpit,stefwalter/cockpit,andreasn/cockpit,deryni/cockpit,cockpituous/cockpit,Scribery/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,mareklibra/cockpit,martinpitt/cockpit,andreasn/cockpit,cockpituous/cockpit,Scribery/cockpit,moraleslazaro/cockpit,andreasn/cockpit,garrett/cockpit,mvollmer/cockpit,stefwalter/cockpit,mareklibra/cockpit,Scribery/cockpit,stefwalter/cockpit,deryni/cockpit,petervo/cockpit,SotolitoLabs/cockpit,garrett/cockpit,garrett/cockpit,cockpituous/cockpit,mvollmer/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpituous/cockpit,andreasn/cockpit,Scribery/cockpit,petervo/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,cockpituous/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,garrett/cockpit,stefwalter/cockpit,mvollmer/cockpit,mareklibra/cockpit,andreasn/cockpit,petervo/cockpit,garrett/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,martinpitt/cockpit,cockpit-project/cockpit,mareklibra/cockpit,petervo/cockpit,stefwalter/cockpit,mareklibra/cockpit