Add PCI device tracker to compute resource tracker

PCI device tracker manages all the PCI devices life cycle.

The resource tracker on a compute node uses the PCI device tracker's
interface to query for resources, claim PCI devices, and alloc and
free PCI devices for instances.

bp:pci-passthrough-base

Change-Id: I766d7f92e26fb75c1d6095dc0237c44f938d4170
Signed-off-by: Yongli He <yongli.he@intel.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Merge "Add PCI device tracker to compute resource tracker"