The test, binlog.binlog_spurious_ddl_errors was failing on pb2 at the statement
      "UNINSTALL PLUGIN example;" with this warning:
      "Warning	1620	Plugin is busy and will be uninstalled on shutdown "
      
      Fix
      Spurious warnings occur in the test since we do not empty the Query cache,
      used by the example plugin at the time of creating tables using the plugin.
      Hence, the query chache is flushed before uninstalling the plugin.
      Also, as part of running the test across platforms, the plugin installation
      script is changed.