Commit 390fab8da4 changed how nova.conf is
generated via the tox genconfig target, however, it fails to load the
'versionutils' namespace entry from nova-config-generator.conf since
nova.openstack.common.versionutils does not exist. The versionutils
module is now in oslo.utils rather than oslo-incubator. That was removed
in commit 2233675941.
Closes-Bug: #1469197
Change-Id: Id182469c4072827f987728f4e72933f97c8f1112
fe0d7e8e3a