Add Greengrass CI job

[sfod]

• Add tests for Greengrass samples: IPC and discovery.
• Add new CI job for Greengrass tests.
• Fix resources leak in greengrass-discovery sample.
• Add to run_in_ci.py script a possibility to provide data to runnable's stdin.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.