Remove empty metrics.go file and method call

Update bazel code file

Author: johscheuer

pkg/controller/nodeipam/BUILD

@@ -26,7 +26,6 @@ go_library(
     name = "go_default_library",
     srcs = [
         "doc.go",
-        "metrics.go",
         "node_ipam_controller.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/controller/nodeipam",

pkg/controller/nodeipam/metrics.go

@@ -39,11 +39,6 @@ import (
 	"k8s.io/kubernetes/pkg/util/metrics"
 )
 
-func init() {
-	// Register prometheus metrics
-	Register()
-}
-
 const (
 	// ipamResyncInterval is the amount of time between when the cloud and node
 	// CIDR range assignments are synchronized.