Dorian/checkprocess

Add service check for the process check.
Better to do this:

```python
if # condition for warning:
    status = AgentCheck.WARNING
if # condition for critical:
    status = AgentCheck.CRITICAL
```

This will protect you in case the thresholds are not included in one another. E.g. warning = [2, 4] and critical = [3, 4] and you have only 1 process.