Fix the LDAP admin authentication option not working.

I'm not actually sure this was ever working, since we were missing the
omniauth callback method.

Author: GUI

src/api-umbrella/web-app/app/controllers/admin/admins/omniauth_callbacks_controller.rb

@@ -56,6 +56,13 @@ def persona
     login
   end
 
+  def ldap
+    uid_field = request.env["omniauth.strategy"].options[:uid]
+    uid = [request.env["omniauth.auth"]["extra"]["raw_info"][uid_field]].flatten.compact.first
+    @email = uid
+    login
+  end
+
   private
 
   def login
@@ -85,6 +92,10 @@ def login
     end
   end
 
+  def signed_in_root_path(resource_or_scope)
+    admin_path
+  end
+
   def after_omniauth_failure_path_for(scope)
     new_admin_session_path
   end

src/api-umbrella/web-app/config/locales/en.yml

@@ -8,6 +8,7 @@ en:
     google_oauth2: Google
     myusa: MyUSA
     persona: Persona
+    ldap: LDAP
   errors:
     messages:
       invalid_host_format: must be in the format of "example.com"