Merge branch 'inet-shrink-netns'

Eric Dumazet says:

====================
inet: shrink netns_ipv{4|6}

This patch series work on reducing footprint of netns_ipv4
and netns_ipv6. Some sysctls are converted to bytes,
and some fields are moves to reduce number of holes
and paddings.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>