Direct execution of pre-installed applications and scripts via EDGAR

[mirenz1]

54 prepares the foundation for running containerized applications on a peer via EDGAR.

This foundation shall be extended in the following way in order to be able to execute pre-installed applications and scripts on a peer:

• test script is pre-installed on peer
• the peer description contains information about the available test scripts
  • name and location of the script
  • description of what the script does
  • description of the parameters, which are supported by the script
• script information is shown in LEA for the respective peer
• test script execution can be triggered via CLEO on a deployed cluster
• CLEO can pass parameters to the script
• EDGAR can track the executions status of a test script and report this status to CARL/LEA
• a particular test script cannot be started several times in parallel on the same peer
• EDGAR can fetch the script exit code and report it to CARL/LEA

Todos:

• [ ] Extend ExecutorDescriptor and related structs, so an user may specify via LEA/CLEO:
  • [ ] name or path of the executable.
  • [ ] environment variables which should be pass.
  • [ ] arguments which should be passed.

[mirenz1]

To be aligned with #5