maintain_kubeusers: don't sleep 1 minute between runs
At the time of this patch, each noop run can take up to 6 minutes with the 3.2k accounts we have in Toolforge.
Sleeping for 1 minute has no point. The parameter may still be useful in some scenarios, so don't dropping it entirely, and setting it to 1 as default.
Signed-off-by: Arturo Borrero Gonzalez aborrero@wikimedia.org