Add InstancePCIRequests object
Add InstancePCIRequests object

Part of blueprint pci-passthrough-sriov

Co-Authored-By: Dan Smith <5d8d18748f16662d1b18967be65277582fc05902@redhat.com>
Co-Authored-By: Baodong (Robert) Li <5f0a6035ebccf665f916d54e9db71922d55aca28@cisco.com>
Change-Id: I125e4afdf98a7073abcb8117bbb7a3e3fe2f9830

openstack/oslo.versionedobjects,citrix-openstack-build/oslo.versionedobjects