Gage Hugo 32da690e50 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:

 - Invalid code example highlighting
 - Redundant loading of todo extension

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

Change-Id: I9a8789b448ffa199b4539f57e692bac251d75036
2017-03-03 14:04:10 -06:00
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