to #26809468, #25931767

Disable deferred struct page init by default since some stability issue
observed.

A new kernel parameter was planed to enable it for large size instance
on demand, for memory init speed up.
Signed-off-by: NShile Zhang <shile.zhang@linux.alibaba.com>
Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com>