Merge branch 'qdisc-ingress-success'

Paul Blakey says:

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net: Fix return value of qdisc ingress handling on success

Fix patch + self-test with the currently broken scenario.

v4->v3:
  Removed new line in self test and rebase (Paolo).

v2->v3:
  Added DROP return to TC_ACT_SHOT case (Cong).

v1->v2:
  Changed blamed commit
  Added self-test
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Signed-off-by: David S. Miller <davem@davemloft.net>