Use standard Devise sessions controller in admin area

Fixes a bug when retrying to login with correct credentials

app/views/admin/sessions/_links.html.erb

@@ -0,0 +1,29 @@
+<%- if controller_name != 'sessions' %>
+    <%= link_to "Log in", new_session_path(resource_name) %><br/>
+<% end -%>
+
+<%- if devise_mapping.registerable? && controller_name != 'registrations' %>
+    <%= link_to "Sign up", new_registration_path(resource_name) %><br/>
+<% end -%>
+
+<%- if devise_mapping.recoverable? && controller_name != 'passwords' &&
+    controller_name != 'registrations' %>
+    <%= link_to "Forgot your password?", new_password_path(resource_name) %><br/>
+<% end -%>
+
+<%- if devise_mapping.confirmable? && controller_name != 'confirmations' %>
+    <%= link_to "Didn't receive confirmation instructions?", new_confirmation_path(resource_name) %>
+    <br/>
+<% end -%>
+
+<%- if devise_mapping.lockable? && resource_class.unlock_strategy_enabled?(:email) &&
+    controller_name != 'unlocks' %>
+    <%= link_to "Didn't receive unlock instructions?", new_unlock_path(resource_name) %><br/>
+<% end -%>
+
+<%- if devise_mapping.omniauthable? %>
+    <%- resource_class.omniauth_providers.each do |provider| %>
+        <%= link_to "Sign in with #{OmniAuth::Utils.camelize(provider)}",
+                    omniauth_authorize_path(resource_name, provider) %><br/>
+    <% end -%>
+<% end -%>

app/views/admin/sessions/new.haml

@@ -1,15 +0,0 @@
-.row
-  .form-signin.col-md-6.center-block.text-center
-    %h2.form-signin-heading.text-center Eesti Interneti SA
-    %hr
-    .form-signin
-      = form_for(@admin_user, url: admin_user_session_path, html: {class: 'form-signin'}) do |f|
-        = render 'admin/shared/errors', object: f.object
-
-        - error_class = f.object.errors.any? ? 'has-error' : ''
-        %div{class: error_class}
-          = f.text_field :username, class: 'form-control', placeholder: t(:username), required: true
-          = f.password_field :password, class: 'form-control', 
-            autocomplete: 'off', placeholder: t(:password), required: true
-        %button.btn.btn-lg.btn-primary.btn-block{:type => 'submit'}= t(:log_in)
-

app/views/admin/sessions/new.html.erb

@@ -0,0 +1,30 @@
+<div class="row">
+    <%= form_for resource, as: resource_name, url: session_path(resource_name),
+                 html: { class: 'col-md-6 form-signin center-block text-center' } do |f| %>
+        <h2 class="form-signin-heading text-center">Eesti Interneti SA</h2>
+
+        <hr>
+
+        <%= f.label :username, class: 'sr-only' %>
+        <%= f.text_field :username, placeholder: AdminUser.human_attribute_name(:username),
+                         required: true,
+                         autofocus: true,
+                         class: 'form-control' %>
+
+        <%= f.label :password, class: 'sr-only' %>
+        <%= f.password_field :password, placeholder: AdminUser.human_attribute_name(:password),
+                             required: true,
+                             autocomplete: 'off',
+                             class: 'form-control' %>
+
+        <% if devise_mapping.rememberable? -%>
+            <div class="checkbox">
+                <label><%= f.check_box :remember_me %> <%= t '.remember_checkbox' %> %></label>
+            </div>
+        <% end -%>
+
+        <%= f.submit t('.sign_in_btn'), class: 'btn btn-lg btn-primary btn-block' %>
+    <% end %>
+</div>
+
+<%= render 'links' %>