Remove obsolete integration experiment run scripts

[dannosliwcd]

Since #2638, we have a single run_experiment.py script to launch all integration app-experiment combinations. We still have several now-obsolete run scripts named run_<experiment>_<app>.py which can be deleted.

In order to delete the obsolete scripts, both the app and experiment need to be listed by run_experiment.py apps and run_experiment.py experiments, respectively.

If an app or experiment is not acknowledged by the launcher, then ensure that:

• Missing apps have a create_appconf(Machine, argv) factory function
• Experiments have launch(app_conf, args, experiment_cli_args)
• Both apps and experiments support setup_run_args(parser)

Also check whether any integration tests directly invoke the old interface. Update them to use the new interface.