Replaced SessionStore :session_key with :key (#6887).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4405 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/environments/test.rb

@@ -17,7 +17,7 @@ config.action_mailer.perform_deliveries = true
 config.action_mailer.delivery_method = :test
 
 config.action_controller.session = { 
-  :session_key => "_test_session",
+  :key => "_test_session",
   :secret => "some secret phrase for the tests."
 }