Fix ldap_user_auth_spec

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

spec/lib/gitlab/ldap/ldap_user_auth_spec.rb

@@ -9,7 +9,8 @@ describe Gitlab::LDAP do
     @info = double(
       uid: '12djsak321',
       name: 'John',
-      email: 'john@mail.com'
+      email: 'john@mail.com',
+      nickname: 'john'
     )
   end