Option to disable random suffix for node names (to have fully predictable node naming)

[knuurr]

Description

Nodes are created with randomized suffix in their name.

Currently there is option to control whenever their numeric index is added to node name, but there is no way to disable randomized suffix.

This would be useful in scenario where for example one provisions many clusters using same codebase and fully predictable naming for certain nodes - like in my case, dedicated longhorn storage nodes - would simplify maintenance, because for now I have to perform some manual actions because I can't know exact node names upfront.

I suggest this could be something that can be controlled ad node level but also at pool level, like it's done with index:

      nodes = {
        "0" : {
          append_index_to_node_name = false,
        },
        "1" : {
          append_index_to_node_name = false,
        },
        "2" : {
          append_index_to_node_name = false,
        },
        "3" : {
          append_index_to_node_name = true,
        },
      }