code: def create_lb_cookie_stickiness_policy(self, cookie_expiration_period,
                                             lb_name, policy_name):
          
          params = {
                      'CookieExpirationPeriod'    :   cookie_expiration_period,
                      'LoadBalancerName'          :   lb_name,
                      'PolicyName'                :   policy_name,
                   }
          return self.get_status('CreateLBCookieStickinessPolicy', params)
docs: Generates a stickiness policy with sticky session lifetimes controlled
          by the lifetime of the browser (user-agent) or a specified expiration
          period. This policy can only be associated only with HTTP listeners.
  
          When a load balancer implements this policy, the load balancer uses a
          special cookie to track the backend server instance for each request.
          When the load balancer receives a request, it first checks to see if
          this cookie is present in the request. If so, the load balancer sends
          the request to the application server specified in the cookie. If not,
          the load balancer sends the request to a server that is chosen based on
          the existing load balancing algorithm.
  
          A cookie is inserted into the response for binding subsequent requests
          from the same user to that server. The validity of the cookie is based
          on the cookie expiration time, which is specified in the policy
          configuration.