adapting bt tests to new discovery function, refs #21

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16188 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
adapting binstate test, refs #21

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16189 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
adapting vclass deprecation test to new error message, refs #21

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@16190 29f149b2-0c63-11e1-8f5c-a347f6a9acd0