updated directories and updated docker config

shared/node_modules/mysql/lib/protocol/sequences/Ping.js

@@ -0,0 +1,19 @@
+var Sequence = require('./Sequence');
+var Util     = require('util');
+var Packets  = require('../packets');
+
+module.exports = Ping;
+Util.inherits(Ping, Sequence);
+
+function Ping(options, callback) {
+  if (!callback && typeof options === 'function') {
+    callback = options;
+    options = {};
+  }
+
+  Sequence.call(this, options, callback);
+}
+
+Ping.prototype.start = function() {
+  this.emit('packet', new Packets.ComPingPacket());
+};