Implement node migration command #139
Description
If a node wants to upgrade to another version of the "hoc cluster", then it is probably best that a new node is created instead and the pods on the old node are migrated away from that and the node is removed from the cluster.
Ideally, the new node should have the same hostname and IP address as the old one, but it might cause issues to have two nodes with the same IP address and hostname. So if it is not possible to implement this for a single node cluster, then migration will only be supported for clusters of at least two nodes, so that one node can receive the incoming nodes until the new one is up and running.