Disable moment deprecation warnings in production (elastic#170827)

## Summary

Disable `momentjs` deprecation warnings in production environment to
avoid unexpected `console.log` entries.

src/cli/dist.js

@@ -9,4 +9,5 @@
 require('../setup_node_env/dist');
 require('./apm')();
 require('../setup_node_env/root');
+require('../setup_node_env/mute_libraries');
 require('./cli');

src/setup_node_env/mute_libraries.js

@@ -0,0 +1,11 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+// disable moment deprecation warnings
+var moment = require('moment');
+moment.suppressDeprecationWarnings = true;