CAY-1870 cgen - smarter default for 'superPkg' and 'destDir',

patch by Oleg Artyukevich

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1578257 13f79535-47bb-0310-9956-ffa450edef68
CAY-1870 cgen - smarter default for 'superPkg' and 'destDir',

fixing failing test - we now have the new path

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1578258 13f79535-47bb-0310-9956-ffa450edef68