[dist] test migrations comming from OBS 2.4 directly

dist/obs-server.spec

@@ -467,7 +467,7 @@ EOF
 # migration test
 export RAILS_ENV=migrate
 bundle exec rake --trace db:create || exit 1
-xzcat test/dump_2.5.sql.xz | mysql  -u root --socket=/tmp/obs.test.mysql.socket
+xzcat test/dump_2.4.sql.xz | mysql  -u root --socket=/tmp/obs.test.mysql.socket
 bundle exec rake --trace db:migrate db:drop || exit 1
 # entire test suite
 export RAILS_ENV=test