Adds functional test for #test_connection.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9053 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merge branch 'stable-functional_test_for_test_connection_v1.0' into split_routing_test_v13