Updated openstack/openstack
Project: openstack/nova  4097f5bb3a08bc333ca2a95fc182d8a44311f6e6
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Add DNSDomain object

Add a new object, DNSDomain, along with a DNSDomainList object.  This is
needed for converting nova-network to use objects so that we can have it
using conductor.

Part of blueprint nova-network-objects

Change-Id: I2e337ccdf9a23a3536ef6bdcd9bf3e4b825d4d74