I don't have a solution for you. I just wanted to share your pain. I just upgraded from 1.9 to 2.2 as well and all questionaires now take me to our 404 page.
Questionnaire (plugin)
Restore 1.9.x questionnaire into Moodle 2.2 Help
Гэтае абмеркаваньне было заблакавана, таму вы болей ня можаце адказваць на яго.