Automatic merge from submit-queue (batch tested with PRs 42216, 42136, 42183, 42149, 36828)
Fix bool parse warning in apimachinery
```golang
var DefaultConverter = NewConverter(parseBool(os.Getenv("KUBE_PATCH_CONVERSION_DETECTOR")))
func parseBool(key string) bool {
value, err := strconv.ParseBool(key)
if err != nil {
utilruntime.HandleError(fmt.Errorf("Couldn't parse '%s' as bool for unstructured mismatch detection", key))
}
return value
}
````
leading to
```
W0227 10:06:01.037] E0227 10:06:01.023502 16550 converter.go:87] Couldn't parse '' as bool for unstructured mismatch detection
```
This staging/src/k8s.io/client-go directory is the staging area of the client repo. It contains a versioned client, tools built around the client like the reflector, and all the client dependencies. The content will be periodically published to k8s.io/client-go repo.
The staged content is copied from the main repo, i.e., k8s.io/kubernetes, with directory rearrangement and necessary rewritings. To sync the content with the latest code in your local k8s.io/kubernetes, you need to run godep restore in k8s root directory, then run staging/copy.sh.
vendor/k8s.io/client-go is a symlink pointing to this staging area, so to use the packages in the staging area, you can import it as "vendor/client-go/", as if the client were vendored. The client will be vendored from k8s.io/client-go for real after the test matrix is converted to vendor k8s components.