This commit fixes a bug in the client-go/testing fixture whereby a
watcher would fire twice for objects with no namespace.
Kubernetes-commit: bd268c9971efd4db46074a80e52ce765583e0787
The FakeWatcher allows sends on the result channel after it's closed,
for example calling Stop() then Add() will panic. RaceFreeFakeWatcher
checks whether the watcher is stopped before attempting to send. It also
panics instead of blocking when the result channel is full.
Kubernetes-commit: b84ad8828b6ffe0dd289f69e395968eabb9fbeaa
fix races with watch call
add test for non-namespace resource watch
add matching for all-namespace-watch
fix delete namespace watch & restrict test
fix multiple invocation on same resource & namespace
add descriptive doc for tracker.watchers
Kubernetes-commit: f57cc0b22d282bc8fe68faf91529e7175bc3918a
