Split login box into different panes, for ldap enabled screens.

app/views/devise/shared/_signin_box.html.haml

-#login-pane.login-box{ role: 'tabpanel', class: 'tab-pane active' }
-  .login-body
-    - if form_based_providers.any?
+- if form_based_providers.any?
   - if crowd_enabled?
-        %div.tab-pane.active{id: "tab-crowd"}
+    .login-box.tab-pane.active{id: "crowd", role: 'tabpanel', class: 'tab-pane'}
+      .login-body
         = render 'devise/sessions/new_crowd'
   - @ldap_servers.each_with_index do |server, i|
-        %div.tab-pane{id: "tab-#{server['provider_name']}", class: (:active if i.zero? && !crowd_enabled?)}
+    .login-box.tab-pane{id: "#{server['provider_name']}", role: 'tabpanel', class: (:active if i.zero? && !crowd_enabled?)}
+      .login-body
         = render 'devise/sessions/new_ldap', server: server
   - if signin_enabled?
-        %div#tab-signin.tab-pane
+    .login-box.tab-pane{id: 'ldap-standard', role: 'tabpanel'}
+      .login-body
         = render 'devise/sessions/new_base'
 
-    - elsif signin_enabled?
+- elsif signin_enabled?
   = render 'devise/sessions/new_base'