Collects PCI class, revision, and bus information for the pci-devices
collector, these metrics as well as vendor id and device id are
components which can be used to construct device information like
lspci output, which is how cyborg agent collects accelerator devices.
Accelerator device based scheduling is possible after ironic has such
information in place.
Change-Id: I6c37c554f37dd5f1d21c8fd4fad2a4f44a3c75d7
Story: 2007971
Task: 40474