run-demo.sh does not run, because of missing heath checks

[SchuhMichael]

There are no reliable heath checks for all docker containers integrated in the run-demo.sh. Some are done implicitly in the ansible playbooks and makefile in the openwhisk deployment, but e.g. the dCache stack lacks such checks atm.
Issue: The run-demo.sh does not run 'at once'
Solution: Copy paste from the script to the shell line-wise. This is meant to be a tutorial anyway, not an automated deployment. Wait for the docker stack to come up completely.
Fix: Add health checks for all involved conatiners and use them in the run-demo.sh script.

[SchuhMichael]

Added health check for the dCache stack (in the run-demo.sh).

[SchuhMichael]

missing:
health check for kafka stream processor