Extends V3 os-hypervisor api for pci support

All pci passthrough code is merged into nova, but the APIs do not support.
this patch extends os-hypervisor to show PCI information for instance and
compute node. This is a part of PCI APIs, for more information see the
blueprint.

Partially implement blueprint pci-api-support

Change-Id: Ia366df257f077c74b1a6639b7078ba4230d3f1a7
Merge "Extends V3 os-hypervisor api for pci support"