Replace HTTP server implementation with Flask API for DNS updates

app.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+
+from flask import Flask
+
+app = Flask('dns-updater')
+
+@app.route('/api/dnsupdate')
+def api_root():
+    return "Welcome to the DNS Updater API"
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=8080)