Use mock pci.ids databse for testing

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Imported-by: John Else <john.else@citrix.com>

Conflicts:
	ocaml/test/test_pci_helpers.ml
Merge pull request #1694 from johnelse/mock-pcidb-tests-master

Use mock pci.ids for testing (from ocaml-pci-db)