Merge branch 'net_sched-clean-up-tc-classes-and-u32-filter'

Cong Wang says:

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net_sched: clean up tc classes and u32 filter

Patch 1 and patch 2 prepare for patch 3. Major changes
are in patch 3 and patch 4, details are there too.

v2: Add patch 1 and 2, group all into a patchset
    Fix a coding style issue in patch 4
====================

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