When doing large runs, a few EC2 instances get their status changed to running (in the EC2 meaning, for EPU it is STARTED) a long time after having requested them (up to 15 minutes, compared to about 30 seconds normally). These instances have booted successfully a long time before their state change and have already been fully contextualized. However, we currently don't check the context of these instances while they are still in PENDING. This commit allows us to change these instances to RUNNING when the context broker reports OK for them.
lacks participant tracking (for disabled_all_agreed) and canceling the leader on connection failure.