Gage Hugo 646cdf5f31 Replace warnerror with warning-is-error ...

"warnerrors" was broken in a previous version of [pbr] and most
projects have abandoned it for [sphinx] warning-is-error, which
provides the same functionality.[0] This change removes
"warnerrors" setting and adds the "warning-is-error" setting under
sphinx for enforcing strict documentation building.

Also added pbr>=3.0.0 as a test-requirement
since it contains a fix for invalid characters within commit
messages that can cause docs builds to fail when "warning-is-error"
is enabled.[1]

[0] http://lists.openstack.org/pipermail/openstack-dev/2017-March/113085.html
[1] http://lists.openstack.org/pipermail/openstack-dev/2017-April/115746.html

Change-Id: Ib80e3cca1826ef103d0cd8ec5a7f4cee84f04012

2017-05-05 17:21:23 -05:00

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