vhost: suppress error if NUMA is not available
vhost: suppress error if NUMA is not available

It's a common case that 'get_mempolicy' fails on systems
without NUMA support. No need to flag an error in log for
this situation.

Signed-off-by: Ilya Maximets <e6f59449982e74b9a8013e88011af79c397f66d7@samsung.com>
Reviewed-by: Tiwei Bie <f338cf29d7d69ff1bc99f755ebfb0eb0accd409e@intel.com>
Reviewed-by: Maxime Coquelin <9a2667dee3b90866bbc9c2696cff2b7d5616c95a@redhat.com>

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