pciDeviceGetVirtualFunctionInfo returns pf netdevice name and virtual
function index for a given vf. This is just a wrapper around existing functions
to return vf's pf and vf_index with one api call

pciConfigAddressToSysfsfile returns the sysfile pci device link
from a 'struct pci_config_address'
Signed-off-by: NRoopa Prabhu <roprabhu@cisco.com>