Code review comment for lp:~axwalk/juju-core/testing-mgo-nounixsocket

It would appear that gocheck uses its own "TempDir" implementation which just loops 100 times and tries to allocate a new directory. However it doesn't seed the random generator, so once we have 100 gocheck dirs, it just fails.

So I'll just resubmit this after cleaning out /tmp. We also had a lot of mongo-XXXX.sock files which this patch itself should make better.