Updated openstack/openstack
Project: openstack/nova  85ecca3dae8d006d05ac66c36fd88732c2112491
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Document virt driver methods that take Instance objects

This catches the virt driver base class' docstrings up with the
current state of support in manager for passing objects.

Related to blueprint virt-objects

Change-Id: Ifc358b5e513a3194785fa83ffe7660b88de6e10a