Refresh monitor configs on reload

[lucklove]

Fix #628

Signed-off-by: lucklove [email protected]

[codecov-commenter]

Codecov Report

Merging #630 into master will increase coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #630      +/-   ##
==========================================
+ Coverage   47.74%   47.96%   +0.21%     
==========================================
  Files         225      225              
  Lines       16749    16786      +37     
==========================================
+ Hits         7997     8051      +54     
+ Misses       7630     7609      -21     
- Partials     1122     1126       +4     

Flag	Coverage Δ
#coverage	47.96% <ø> (+0.21%)	⬆️

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%)	⬇️
...m/pingcap/tiup/components/playground/playground.go	30.17% <0.00%> (+0.96%)	⬆️
.../pingcap/tiup/components/cluster/command/reload.go	72.51% <0.00%> (+10.81%)	⬆️
.../pingcap/tiup/components/playground/utils/utils.go	31.91% <0.00%> (+31.91%)	⬆️

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[lonng]

LGTM