metrics/librato: ensure resp.body closed (#26969)

This change ensures that we call Close on a http response body, in various places in the source code (mostly tests)

node/node_test.go

@@ -615,6 +615,7 @@ func doHTTPRequest(t *testing.T, req *http.Request) *http.Response {
 	if err != nil {
 		t.Fatalf("could not issue a GET request to the given endpoint: %v", err)
 	}
+	t.Cleanup(func() { resp.Body.Close() })
 	return resp
 }
 

node/rpcstack_test.go

@@ -320,6 +320,7 @@ func baseRpcRequest(t *testing.T, url, bodyStr string, extraHeaders ...string) *
 	if err != nil {
 		t.Fatal(err)
 	}
+	t.Cleanup(func() { resp.Body.Close() })
 	return resp
 }