Improve SampleVNF hugepages setup

Improve SampleVNF hugepages setup

The goal of this function is to:
- Read the default hugepage size.
- Set 16GB of hugepages.
- Check if the status of the last action.

According to [1], the default hugepage size could be read in
"/proc/meminfo", always in kB. Then "/proc/sys/vm/nr_hugepages"
could be used to set the number of default hugepages.

[1] https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt

JIRA: YARDSTICK-997

Change-Id: I762d1b16294ba1c1c2feee56610819ac358c7410
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>