[dts] framework v2: hugepages, cpuinfo, connect x3 support and bug fixes

[Gowrishankar]

Following are set of patches addressing below:

1. hugepages setting and cpu info parsing for powerpc environment in a platform
   independent way.
2. enable connect x3 support to run DTS.
3. some bug fixes in framework as well as tests handling numa, cpu coremask
   and expected output.
   
Changes from version 1:
 - interface name for second port sharing same PCI id is stored in variable 'intf2'
   instead 'peer' as earlier, also relavant function names.
 - check interface name and mac retrieved from DUT scan.
 

Thanks,
Gowrishankar