internal/{dag,contour}: reimplement kubernetes/ingress.class support #504
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Fixes #483
Reimplement ingress.class support in contour's DAGAdapter. There is some
trickiness in ensuring that if an ingress is edited from valid (matching
the ingress.class rules) to invalid then the previous version needs to
be purged from the DAG cache. The internal/e2e tests now capture this.
Signed-off-by: Dave Cheney dave@cheney.net