Passing a context to StartWithContext enables context-aware reflector
logging. This is the main remaining source of log spam (output to stderr
instead of per-test logger) in controller unit tests.
WaitForCacheSynceWithContext takes advantage of the new cache.WaitFor +
NamedHasSynced functionality to finish "immediately" (= no virtual time
passed) in a synctest bubble. While at it, the return type gets improved so
that a failure is easier to handle.
Kubernetes-commit: 5ff323de791df88880f6e065f5de4b445e5c90ed
For compatibility reasons, the old functions without the ctx parameter still
get generated, now with context.Background instead of context.TODO. In practice
that code won't be used by the client-go reflector code because it prefers
the *WithContext functions, but it cannot be ruled out that some other code
only supports the old fields.
Kubernetes-commit: 8cc74e8a266e1042be1c60adfa3091852036f48a
SharedInformerFactory starts goroutines in Start and those can be stopped by
closing the stop channel. However, there was no API that waits for the
goroutines.
This is a problem for unit testing. A test has to return while the informers
are still running, which may get flagged by tools like
https://github.com/uber-go/goleak or by klog/ktesting when those informers
lead to log output.
While at it, more documentation gets added to address
https://github.com/kubernetes/kubernetes/issues/65036.
Kubernetes-commit: e89d1d47e8365cad31600b17dab662d3c8a359dd
