usertools: optimize lspci invocation

usertools: optimize lspci invocation

lspci invoked twice over all the pci devices in the system.
The first pass is to extract Numeric IDs and second pass to get extended
device details.

As an optimization, Used lspci with -nn option in get_device_details()
to obtain Numeric ID and extended device details in one shot.

In addition to this, After binding the PCI device, lspci needs to be
invoked again to confirm the proper bind operation. Used a boolean
argument to express this case in get_pci_device_details()

Signed-off-by: Guduri Prathyusha <gprathyusha@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>