mysql-test/r/ps_ddl.result:
  Updated results
mysql-test/t/ps_ddl.test:
  - add missing subtests
  - add comments + minor reformatting for better overview on content
mysql-test/r/ps_ddl1.result:
  Expected results
mysql-test/t/ps_ddl1.test:
  Script for tests which do not really fit into ps_ddl