Code review comment for lp:~axwalk/juju-core/lp1225825-netlookupip-ip

The bot failure is because go check doesn't seed its random-directory generator, and we hit 100 leaked directories.

I think we have a bug somewhere that is causing us to not clean up a dir during testing, but unfortunately I thought of that right after I nuked all the dirs, so it will be hard to figure out where until this happens again.