Add criticality info to start/end_test listener methods
Add criticality info to start/end_test listener methods

Update issue 905:
Status: Started
Owner: pekka.klarck
Code done. Tests and docs to do.

ldtri0209/robotframework,fiuba08/robotframework,ldtri0209/robotframework,waldenner/robotframework,waldenner/robotframework,fiuba08/robotframework,ldtri0209/robotframework,fiuba08/robotframework,fiuba08/robotframework,ldtri0209/robotframework,waldenner/robotframework,waldenner/robotframework,waldenner/robotframework,ldtri0209/robotframework,fiuba08/robotframework