mem: attempt multiple hugepage allocations at init

mem: attempt multiple hugepage allocations at init

When requesting memory with ``-m`` or ``--socket-mem`` flags,
currently the init will fail if the requested memory amount was
bigger than any one memseg list, even if total amount of
available memory was sufficient.

Fix this by making EAL to attempt to allocate pages multiple
times, until we either fulfill our memory requirements, or run
out of hugepages to allocate.

Bugzilla ID: 95

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>