Log real file's name and line
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>

Kubernetes-commit: 7e7b01fa3103e272ca4acc5a4fac6a9119c2623d

kubernetes/apiserver,kubernetes/apiserver