Permission error while reading HDFS file

Hi,

I have dask-gateway set up on our hadoop cluster with yarn.

Without establishing a connection to the gateway, a simple csv read from hdfs works perfectly.
```
df = dask.dataframe.read_csv('webhdfs://namnode.example.com/path/tocsv.csv', storage_options={'kerberos':True})
df.tail()
```

However as soon as I establish the gateway cluster connection, this fails with **Exception: PermissionError()** in the worker log.

A simple print(df) is able to read the dataframe structure correctly.

I'd appreciate any inputs on what I'm missing!