This reverts commit 5d7e6cd9e7.
This patch isn't really needed; we have a warning in Horizon
(https://review.openstack.org/#/c/443716/) which has been proposed for
backport to stable. This is just a bug in the Ubuntu packages, and docs
shouldn't be expected to carry a workaround for a bug which already
logs a warning.
Change-Id: I3888a7cd671394d67d388106defb2358389f13e8
54260e3fe0