Description of problem:
When an ADS user tries to login SAM when the ADS server is actually down - the log in page just refreshes without any error message.

Version-Release number of selected component (if applicable):
* candlepin-0.7.23-1.el6_3.noarch
* candlepin-tomcat6-0.7.23-1.el6_3.noarch
* elasticsearch-0.19.9-5.el6_3.noarch
* katello-candlepin-cert-key-pair-1.0-1.noarch
* katello-certs-tools-1.2.1-1h.el6_3.noarch
* katello-cli-1.2.1-11h.el6_3.noarch
* katello-cli-common-1.2.1-11h.el6_3.noarch
* katello-common-1.2.1-12h.el6_3.noarch
* katello-configure-1.2.3-1h.el6_3.noarch
* katello-glue-candlepin-1.2.1-12h.el6_3.noarch
* katello-headpin-1.2.1-12h.el6_3.noarch
* katello-headpin-all-1.2.1-12h.el6_3.noarch
* katello-selinux-1.2.1-2h.el6_3.noarch
* thumbslug-0.0.28-1.el6_3.noarch
* thumbslug-selinux-0.0.28-1.el6_3.noarch


How reproducible:
All Times

Steps to Reproduce:
1. yum install -y katello-headpin-all
2. katello-configure --deployment=sam [add options supporting AD configuration]
3. When ADS server is down, attempt to login to SAM UI using AD user credentials (Eg. Administrator/*****)
  
Actual results:
The log in page refreshes without any error message.

Expected results:
Error message saying ADS is not responding.

Additional info: