Log real file's name and line

pkg/kubectl/util/logs & staging/src/k8s.io/apiserver/pkg/util/logs
use `glog.info(...)` but this function is not made to be wrapped because
the underlying mechanism use a fixed call trace length to determine
where the log has been emited.

This results is having `logs.go:49` in the logs which is in the body
of the wrapper function and thus useless.

Instead use `glog.infoDepth(1, ...)` which tells the underlying mechanism
to go back 1 more level in the call trace to determine where the log
has been emitted.

Signed-off-by: Sylvain Rabot <sylvain@abstraction.fr>

pkg/kubectl/util/logs/logs.go

@@ -38,7 +38,7 @@ type GlogWriter struct{}
 
 // Write implements the io.Writer interface.
 func (writer GlogWriter) Write(data []byte) (n int, err error) {
-	glog.Info(string(data))
+	glog.InfoDepth(1, string(data))
 	return len(data), nil
 }
 

staging/src/k8s.io/apiserver/pkg/util/logs/logs.go

@@ -46,7 +46,7 @@ type GlogWriter struct{}
 
 // Write implements the io.Writer interface.
 func (writer GlogWriter) Write(data []byte) (n int, err error) {
-	glog.Info(string(data))
+	glog.InfoDepth(1, string(data))
 	return len(data), nil
 }