This patch addresses a documentation build issue caused by the
oslo.config sphinx integration. In order to unblock this repo, we can
work around the issue here while fixing it in oslo.config, then revert
this change.
Change-Id: Ie4a29e8e8d44d00354ea0dd8420bac5b8812a717
Related-Bug: #1549106
Signed-off-by: Doug Hellmann <doug@doughellmann.com>