kubespray

The doc[1] explains we need to specify

  "-e reset_nodes=false -e allow_ungraceful_removal=true"

to delete offline node. However the task "Gather facts"
tried to gather facts of offline node also and the task
was failed.
This adds a condition to skip gathering facts when reset_nodes
is false on remove-node.yml.

[1]: https://github.com/kubernetes-sigs/kubespray/blob/master/docs/nodes.md#3-remove-an-old-node-with-remove-nodeyml