Updated openstack/openstack
Project: openstack/nova  fa20f1bc7564d627305d4a36ff426f793c337e6c
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Add comment/doc about utils.mkfs in rootwrap

We call mkfs in nova/utils.py as well. Updates
the rootwrap file so we document this.

Change-Id: I58a3f4686735f45ee1aafe698f6662ff9d70e1f1