Test the permissions for deploying custom resources

For some benchmarks, custom resources are specified as part of the app resources. At the moment, this is only the service monitor. To provide a custom resource object, fabric8 needs to know the context information. To do this, we request all currently registered CRDs from Kubernetes and build a context object from them. This is done in the CustomResourceWrapper. Since this request has a cluster-wide scope (and not just namespaced), we need the right permissions.

related to #116 (closed)