kubelet: Make service environment variables optional

pkg/apis/core/zz_generated.deepcopy.go

@@ -3556,6 +3556,11 @@ func (in *PodSpec) DeepCopyInto(out *PodSpec) {
 		*out = new(string)
 		**out = **in
 	}
+	if in.EnableServiceLinks != nil {
+		in, out := &in.EnableServiceLinks, &out.EnableServiceLinks
+		*out = new(bool)
+		**out = **in
+	}
 	return
 }