This commit adds support to create zone outage in AWS by denying both
ingress and egress traffic to the instances belonging to a particular
subnet belonging to the zone by tweaking the network acl. This creates
an outage of all the nodes in the zone - both master and workers.
This commit:
- Adds a node scenario to stop and start an instance
- Adds a node scenario to terminate an instance
- Adds a node scenario to reboot an instance
- Adds a node scenario to stop the kubelet
- Adds a node scenario to crash the node