Updated openstack/openstack
Project: openstack-dev/devstack  1357d0977a3efe91609fd68b0b5c5ba1aba762a5

remove kernel override ability

This was landed to try to address an issue with netns vs nbd during
icehouse development. It never really got us anywhere, and is now
just cruft.

Change-Id: Ie498fae8d1f796c1fc83459c65d0de948d1d50ce