usertools: use sysfs for CPU layout
usertools: use sysfs for CPU layout

Some platforms do not have core/socket info in /proc/cpuinfo.
Use /sys/devices/system/cpu instead.

Signed-off-by: Andriy Berestovskyy <5a0adb12ae95814153dc6089b3d01dffbbe8369c@caviumnetworks.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk