added some explanations in reports_controller_test, fact_values_test, users_controller_test, fact_value_controller_test, user_test, about why there is some missing tests. Refactored the auth_source_ldap_controller.
added some explanations in reports_controller_test, fact_values_test, users_controller_test, fact_value_controller_test, user_test, about why there is some missing tests. Refactored the auth_source_ldap_controller.