Support hwloc 2.x.x

Support hwloc 2.x.x

Created compatibility layer to account for API changes moving
from hwloc 1.x.x to 2.x.x while retaining support for v1.x.x.

Changes supporting hwloc 2.x.x include:
    -reworked descendents lookup in topology tree to account for new
     division of object children into "normal", "memory", and "io" types
    -different memory access location for hwloc objects
    -accessing distances (latencies) between nodes has been reworked
    -different flags for accessing PCI devices
    -changed numa node ancestor search to account for numa nodes no
     longer being a normal part of topology tree

Fixes #2539

Change-Id: I483dda3dd344d8f7c99aa828bcc118a3d2de9dfd