Merge branch 'net_sched-dump-no-rtnl'

Eric Dumazet says:

====================
net_sched: first series for RTNL-less qdisc dumps

Medium term goal is to implement "tc qdisc show" without needing
to acquire RTNL.

This first series makes the requested changes in 14 qdisc.

Notes :

 - RTNL is still held in "tc qdisc show", more changes are needed.

 - Qdisc returning many attributes might want/need to provide
   a consistent set of attributes. If that is the case, their
   dump() method could acquire the qdisc spinlock, to pair the
   spinlock acquision in their change() method.

V2: Addressed Simon feedback (Thanks a lot Simon)
====================

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

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