generic `bin/run_*_examples.sh` scripts

[melihc1]

Current state:

• we have separate scripts for each cloud provider

Desired state:

• we want to have a common script to cover all examples
• the parts that differ can be moved to:
  • a) small sub-scripts (sourced from the common script)
  • b) functions within the common script
• define the cloud provider when calling the script