Revert "feature: use simplesamlPHP server v2"

This reverts commit cb1ca35.

- reverting because we have fully replace the old server
  (http://simplesamlphp.uaa-acceptance.cf-app.com is now the
  simplesamlPHP v2)

uaa/src/test/java/org/cloudfoundry/identity/uaa/integration/util/IntegrationTestUtils.java

@@ -86,7 +86,7 @@
 
 public class IntegrationTestUtils {
 
-    public static final String SIMPLESAMLPHP_UAA_ACCEPTANCE = "http://simplesamlphp2.uaa-acceptance.cf-app.com";
+    public static final String SIMPLESAMLPHP_UAA_ACCEPTANCE = "http://simplesamlphp.uaa-acceptance.cf-app.com";
     public static final String SIMPLESAMLPHP_LOGIN_PROMPT_XPATH_EXPR =
         "//h1[contains(text(), 'Enter your username and password')]";
     public static final String SAML_AUTH_SOURCE = "example-userpass";