Support refresh configuration only when reload

[lonng]

Signed-off-by: Lonng heng@lonng.org

What problem does this PR solve?

Support refresh configuration only when reload

Check List

Tests

• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Related changes

• Need to update the documentation

[codecov-commenter]

Codecov Report

Merging #625 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #625   +/-   ##
=======================================
  Coverage   47.85%   47.85%           
=======================================
  Files         225      225           
  Lines       16747    16749    +2     
=======================================
+ Hits         8014     8016    +2     
  Misses       7608     7608           
  Partials     1125     1125           

Flag	Coverage Δ
#coverage	47.85% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...c/github.com/pingcap/tiup/pkg/cluster/api/pdapi.go	52.17% <0.00%> (-1.25%)	⬇️
.../pingcap/tiup/components/cluster/command/reload.go	61.70% <0.00%> (+0.83%)	⬆️
.../pingcap/tiup/components/playground/utils/utils.go	31.91% <0.00%> (+4.25%)	⬆️
...c/github.com/pingcap/tiup/pkg/utils/http_client.go	76.19% <0.00%> (+4.76%)	⬆️

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[july2993]

LGTM