Updated openstack/openstack
Project: openstack/nova  76e866a74b6a2eb02b6e4fb3b6e2c6356f020675

Fix direct use of block_device module objects

This replaces all uses of nova.objects.block_device.Block* with
nova.objects.Block*.

Partial-Blueprint: object-subclassing

Change-Id: I7b7641cc75bbc180abd36920deedcb097fc3ecbc