Fix Mango text index tests

[willholley]

Overview

The text index tests are not routinely run by the Couch CI
(due to an external dependency that isn't shipped with Couch).
This fixes a number of tests that were broken as a result of
recent feature changes.

Testing recommendations

Run the mango tests with text indexes enabled.

Related Issues or Pull Requests

Checklist

• Code is written and works correctly;
• Changes are covered by tests;
• Documentation reflects the changes;

[wohali]

I'd like to hold back on a +1 here until someone can run CouchDB (not Cloudant) with Mango and clouseau/dreyfus enabled to validate that this works. Don't rely on the Travis CI results here to provide that for you.

Perhaps in the future we can look at adding clouseau/dreyfus to the CI run. Just because we can't ship them with CouchDB doesn't mean we can't test against them! :)

[tonysun83]

+1.
I setup dreyfus/clouseau and cherry-picked this commit and ran the entire test bucket:

(venv)Tonys-MBP:test tonysun$ MANGO_TEXT_INDEXES=1 nosetests
...................................................S.S.S.S............S.S.S.S............S.S.S.S.............................................................S................................................................................................................
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