BitOps Integration Tests

[arm4b]

Outside of the Unit Tests #286 where we test lower-level function details,
we'll need Integration Tests to verify different BitOps scenarios as a complete tool.

The main logic is in the 2 main files:

• deploy_plugins.py
• install_plugins.py

Test scenarios could be:

• BitOps finishes OK on some dummy opsrepo
• BitOps plugin installation is run OK on some dummy config
• Ensure the BitOps executes deployment per bitops config
• Verify if before/after hooks were really ran
• Verify the deployment order
• Exit with non-zero return code on different error(s)