title: Cognito after logout then login, still get "logins don't match" error
body: <p>I have a logged in user, and I logout with:</p>
  
  <pre><code>cognitoUser.signOut();
  </code></pre>
  
  <p>Then I try to login as a different user.</p>
  
  <p>An error is received that says "logins don't match".</p>
  
  <p>How do I logout a user properly so this error doesn't happen upon the first new login attempt?</p>