clean up error codes

[pohly]

https://github.com/kubernetes/kubernetes/blob/ca532c6fb2c08f859eca13e0557f3b2aec9a18e0/pkg/volume/csi/csi_client.go#L627-L649 lists the error code that cause Kubernetes to retry an operation.

We often just return InternalError when some operation failed, for example in https://github.com/kubernetes/kubernetes/blob/ca532c6fb2c08f859eca13e0557f3b2aec9a18e0/pkg/volume/csi/csi_client.go#L627-L649

InternalError is a final error, which may or may not be correct here. We should check the errno and only return a final error when we don't expect that the problem will ever go away.