Print a summary at the end of a batch run

[thekorn]

In the past there were alot of "disconnecting from ...." messages at the end of a "list_nodes_with_role:" run. With recent changes, the connection is closed after each node. this means we lost this kind of summary. I used this disconnecting massages in the past to see which nodes were changed in long runs.

It would be nice to have atleast a list of changed nodes at the very end