Initial import

This is a simple WorkLoad Generator (WLG) which allows to spawn a custom
set of worker thread. Each thread could be configure to mimic a workload
class.

The class provided are:
1. BATCH       - CPU hungry tasks
2. INTERACTIVE - tasks which activate once a while for a short time
3. PERIODIC    - tasks with a period and processing duty cycle

These three classes allows to setup custom workload mixes which could be
useful to evaluate scheduler performance.

Signed-off-by: Patrick Bellasi <derkling@gmail.com>