[easybuild] Python Package sanity check import other name

[Niek de Klein]

Dear list,

I am writing an easyconfig for BeautifulSoup4 (
https://pypi.python.org/pypi/beautifulsoup4).
The sanity check tries to import it with import beautifulsoup4. However, to
import beautifulsoup the actual command is

   from bs4 import BeautifulSoup

How can I change how it tries to import for sanity checking? I now tried to
overwrite it with setting sanity_commands, but it does not overwrite. I can
change the name to bs4, but then it can not find bs4-4.4.1.tar.gz.

Thanks,
Niek