title: Serverless keeps trying to create user pool domain when it already exist
body: <p>I have a aws cognito user group configured to my serverless.yml. Whenever I do a serverless deploy, it will try to create the same user pool domain even though it already exist, hence returning me the error of:</p>
  
  <pre><code>[aws-cognito-idp-userpool] domain already exist
  </code></pre>
  
  <p>The only workaround is for me to delete the user pool domain every time I want to do a serverless deploy from the AWS UI. Anyone faced this issue before?</p>