Update job execution status on cluster deletion

On cluster creation Sahara now does:
1. remove cluster_id (as before)
2. don't change status and end_time for finished jobs
3. change status to 'FAILED' and update end_time for not finished jobs

Change-Id: Ia26cb20565d50af71032d0e739c272b3ade0e8ee
Closes-Bug: #1329109
Merge "Update job execution status on cluster deletion"