Gage Hugo cfcf9ef798 Remove pbr warnerrors in favor of sphinx check ...

This change removes the unused "warnerrors" setting that
was part of [pbr], which was replaced by "warning-is-error"
in sphinx 1.5 and above[0]. This also fixes any warnings
and errors that came up when running `tox -edocs` using
this new feature:

 - Specified correct instance of 'List'

This change also adds the "warning-is-error" setting
to setup.cfg in order to allow for strict doc validation
which will cause doc building to fail if any warnings
are thrown.

[0] http://lists.openstack.org/pipermail/openstack-dev/2017-March/113085.html

Change-Id: I8111193e5a1ae7d063ab4cc37186aea1299964a4

2017-04-24 16:28:06 -05:00

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