Comment 2 for bug 1583715

> Noting that GET /api/version also appears to be requiring
> authentication, which we should probably fix in one fell swoop; here's
> a test run by Mike P.: https://paste.ubuntu.com/16664676/

lp:~allenap/maas/api-testing-for-multiple-users-and-clients addresses
this, and also adds more testing to catch things like this in future.
It's not quite ready yet but will be very soon, and I'll backport the
important bit to 1.9.