code: def get_app():
      
      from bottle import default_app
      default_app.push()
      for module in ("mongo_orchestration.apps.servers",
                     "mongo_orchestration.apps.replica_sets",
                     "mongo_orchestration.apps.sharded_clusters"):
          __import__(module)
      app = default_app.pop()
      return app
docs: return bottle app that includes all sub-apps