eal/linux: improve no hugepages logging

eal/linux: improve no hugepages logging

When no hugepages are found, we log a message about it, but we never
specify on which node. We also implicitly declare the page size based
on the directory name, but that's not very user friendly.

Fix both by changing the text of the message to note the NUMA node (if
applicable) and explicitly mention page size in kilobytes.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>