- this test creates a real SAML provider (pointing to a running saml
  server:
  http://simplesamlphp.uaa-acceptance.cf-app.com/saml2/idp/metadata.php)
  and also a dummy SAML provider (pointing to a randomly generated saml idp
  metadata). Before this commit, the test is mistakenly performing
  SAML flow via the dummy provider only (which somehow works currently
  on this branch but is probably not what this test intends to do). This
  is because the two providers have identical login link texts (which
  are shown on the UAA login page) and the click action ends up clicking
  the wrong provider link text.
- this commit fixes the issue by differentiating the two providers
  by different login link text, so that the test is now performing
  SAML flow via the real IDP.