tiup cluster reload specifies the node/role, but all the configurations of the entire cluster are refreshed

[jacktd9]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

 tiup cluster reload dba-test -R prometheus

2. What did you expect to see?
   Only the prometheus configuration is refreshed

3. What did you see instead?
   The configuration of all nodes in the cluster is refreshed

4. What version of TiUP are you using (tiup --version)?
   tiup v1.5.2

[lilyjazz]

without this issue, the reload operation is not blocked. So, it is not a bug, but a request to polish the current issue. We are plan to finish it on ver 1.6.0.

[AstroProfundis]

This is a dupe w/ #595