Fix golint failures in some pkg/kubelet packages

Fixed:
- pkg/kubelet/pod
- pkg/kubelet/metrics
- pkg/kubelet/configmap
- pkg/kubelet/config

pkg/kubelet/config/common.go

@@ -14,7 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// Common logic used by both http and file channels.
 package config
 
 import (
@@ -30,11 +29,11 @@ import (
 	utilyaml "k8s.io/apimachinery/pkg/util/yaml"
 	api "k8s.io/kubernetes/pkg/apis/core"
 	"k8s.io/kubernetes/pkg/apis/core/helper"
+
 	// TODO: remove this import if
 	// api.Registry.GroupOrDie(v1.GroupName).GroupVersion.String() is changed
 	// to "v1"?
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
-	_ "k8s.io/kubernetes/pkg/apis/core/install"
 	k8s_api_v1 "k8s.io/kubernetes/pkg/apis/core/v1"
 	"k8s.io/kubernetes/pkg/apis/core/validation"
 	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
@@ -110,6 +109,7 @@ func getSelfLink(name, namespace string) string {
 
 type defaultFunc func(pod *api.Pod) error
 
+// tryDecodeSinglePod takes data and tries to extract valid Pod config information from it.
 func tryDecodeSinglePod(data []byte, defaultFn defaultFunc) (parsed bool, pod *v1.Pod, err error) {
 	// JSON is valid YAML, so this should work for everything.
 	json, err := utilyaml.ToJSON(data)