bluebanquise dikless fails because of "requests" module

After Bluebanquise installation, bluebanquise-diskless is failing with the following error:
```bash
$ sudo bluebanquise-diskless -h
Traceback (most recent call last):
  File "/bin/bluebanquise-diskless", line 85, in <module>
    import requests
ModuleNotFoundError: No module named 'requests'
```
