Skip tests against autocomplete endpoint when in autocomplete mode

[orangejulius]

With the addition of autocomplete mode a while back, we have a great tool for viewing the quality of our autocomplete results. Since then, we've identified some autocomplete queries that we really want to return good results, and added them to acceptance tests.

This is fine for the normal invocation of the acceptance tests, but when we're running autocomplete mode, it leads to some unneeded clutter:

The easiest way to fix this is probably, paradoxically, to skip tests that hit the autocomplete endpoint when running in autocomplete mode.