fold me "mm, page_alloc: rip out ZONELIST_ORDER_ZONE"

- do not print Default in sysctl handler because our behavior was rather
inconsistent in the past numa_zonelist_order was lowecase while
zonelist_order_name was uppercase so boot time unchanged value woul
print lowercase while updated value could be uppercase. Print "Node"
which is the default instead - Mel

Signed-off-by: Michal Hocko <mhocko@suse.com>
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