test_mogilefs: fix broken test case that was timing out
test_mogilefs: fix broken test case that was timing out

And incorrectly nested assertions in the tests made
sure the errors were never caught, too.

Now the unit tests run in about 3s for me

Damn Ruby conventions and 2-space indents...

drasch/mogilefs-client,godfat/not-used-mogilefs-client,songkick/mogilefs-client