Merge branch 'pernet-convert-part6'

Kirill Tkhai says:

====================
Converting pernet_operations (part #6)

this series continues to review and to convert pernet_operations
to make them possible to be executed in parallel for several
net namespaces in the same time. There are sctp, tipc and rds
in this series.
====================

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