When running on Docker Swarm, the RBD-healer fails with an error like:
> healer had failures, err failed to get cluster config: unable to load
> in-cluster configuration, KUBERNETES_SERVICE_HOST and
> KUBERNETES_SERVICE_PORT must be defined
Before starting the healer, check if we're running on Kubernetes, so
that non-Kubernetes platforms do not get confusing warnings.
Updates: #3769
Signed-off-by: Niels de Vos <ndevos@ibm.com>
437d90c84d