Added a new field in the nodeinfo called quarantined_instances_info
This holds an object like `"quarantined_instances_info":{"quarantined_instances":{"quar.inst":{"reason":"whatever reason"}}}}`
It's easiest (and imo most proper) to use tuples {"instance, "reason"} in BE,
but for FE maps like %{"instance": "instance", "reason", "reason"} are better.
I changed it so that node_info returns maps now for simple_policy and quarantined instances.
Ilja