Possibility to configure Node status conditions to run fencing

[ErmakovDmitriy]

At the moment, the fencing controller checks only NodeReady condition ( https://github.com/kvaps/kube-fencing/blob/master/pkg/controller/node/node_controller.go#L92 ).

It could be nice to be able to configure additional conditions which will trigger fencing.

The motivation to have it is that if one uses Kubernetes Node-Problem-Detector, there could be more conditions which are configured by an administrator.
These conditions may not cause a Node to have Ready=false but may still require fencing (node reboot) to restore normal operation.

P.S. I may try to make necessary changes, if this is considered to be a necessary feature.