Updated openstack/openstack
Project: openstack/nova  60f30c2651bbc4fa6a84d35e19bcab6031be32f6
null
Add experimental warning for Cells

When we merged Cells a while back, we noted that the usage was
experimental but haven't had a good channel for communicating the
continued state to the user. Since we're adding warning messages
to virt drivers, this patch adds one for Cells as well, in the
Manager's init method.

Change-Id: I75b0bedf57250e7701b00f9ce0f60e4775eacfd7