Stephen Finucane d114804f1a Use Sphinx 1.5 warning-is-error
With pbr 2.0 and Sphinx 1.5, the setting for treat sphinx warnings as
errors is setting warning-is-error in build_sphinx section. Migrate
the setting from the old warnerrors one.

There are a couple of small items to be cleaned up.

Change-Id: I01b1ac49c69d001ea25a475d903311d0b592656e
2017-03-23 11:51:45 +00:00
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