Vu Cong Tuan 667ad45615 Remove pbr warnerrors in favor of sphinx check
This change removes the now unused "warnerrors" setting,
which is replaced by "warning-is-error" in sphinx
releases >= 1.5 [1].

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

Change-Id: I9bf18ff72f36dfd3496b9672604e8bb98999b133
2017-06-11 18:18:28 +07:00
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