Confirmation messages for cluster, profile, policy, receiver and node
deletions are printed using sys.stdout.write. However sys.stdout.write
output is line-buffered [1]. Since the confirmation message does not
contain a newline, the message may not appear in the user's terminal.
[1] https://docs.python.org/3/library/sys.html#sys.stdout
Change-Id: I829811df362bcfd7d074523958d2aa5232da6f09
Closes-Bug: 1861042