Refactor of the bugreport code.

Implemented these changes:

- Make this code C++.
- Avoid hangs by adding a timeout.
- Add the necessary TEMP_FAILURE_RETRY calls.
- Restructure the code a bit.

Bug: 18800936

Change-Id: Iba9f86a4c7beee4f0f36e51234855f4c0834db47