DERBY-6459: Fix SimpleApp test failures

Update canon to match the changed demo.

Make the simpledemo suite use old-style JDBC driver autoloading (by
setting the jdbc.drivers property) so that it succeeds when running
from classes without reintroducing Class.forName() in SimpleApp.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1569662 13f79535-47bb-0310-9956-ffa450edef68