Updated openstack/openstack
Project: openstack/oslo.rootwrap  1ae6e9d867ab776bce4c267e5217ed92a3e0aae0

Let tests pass on distros where "ip" is in /bin

E.g. Gentoo places ip utility to /bin and so tests constantly fail for me.

Change-Id: Ibc166e3f0d8aafa39be66f595bb9e9a4335adc85