- no need to use --skip-ndb in collections files anymore, since long but
  more clear logic after recent mtr.pl fixes. ndb tests are never run in MySQL Server
  unless explicitly requested
 - remove sys_vars.ndb_log_update_as_write_basic.test and sys_vars.ndb_log_updated_only_basic.result since MySQL Server does not have those
  options.
 - Only sys_vars.have_ndbcluster_basic left since MySQL Server has that variable hardcoded.