Extend graphical reports for device-type
Extend graphical reports for device-type only to show:
- Utilisation - i.e. time vs % of objects in use in that time frame.
- Build queue length from difference in submitted time vs start time of test jobs for that type.
- Push utilisation above 100% if queue present.
- How many jobs would be runnable at any specific time.
- Compare with how load is calculated on a UNIX system.
- Target goal of 100%.
- Include the average job timeout of all jobs in the queue.
- Include requested timeout vs actual duration information as well. Might as well include Std Dev.
Migrated from https://projects.linaro.org/browse/LAVA-598