Fix init config with check config

[lucklove]

Signed-off-by: lucklove gnu.crazier@gmail.com

What problem does this PR solve?

The scale-in process doesn't need to check config at all. But it still fails when other errors in the config check stage threw.

What is changed and how it works?

All errors in the config check stage should be config check error

[ti-srebot]

@AstroProfundis,Thanks for your review.

[codecov-commenter]

Codecov Report

Merging #583 into master will increase coverage by 9.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #583      +/-   ##
==========================================
+ Coverage   39.84%   49.45%   +9.61%     
==========================================
  Files         201      218      +17     
  Lines       14847    15807     +960     
==========================================
+ Hits         5916     7818    +1902     
+ Misses       8072     6903    -1169     
- Partials      859     1086     +227     

Flag	Coverage Δ
#coverage	49.45% <ø> (+9.61%)	⬆️

Impacted Files	Coverage Δ
...o/src/github.com/pingcap/tiup/server/store/sync.go	28.57% <0.00%> (-28.58%)	⬇️
....com/pingcap/tiup/pkg/cluster/clusterutil/retry.go	50.00% <0.00%> (-17.50%)	⬇️
go/src/github.com/pingcap/tiup/cmd/mirror.go	39.95% <0.00%> (-6.89%)	⬇️
...ingcap/tiup/components/playground/instance/tidb.go	85.36% <0.00%> (-5.34%)	⬇️
...ingcap/tiup/components/playground/instance/tikv.go	75.00% <0.00%> (-4.32%)	⬇️
go/src/github.com/pingcap/tiup/cmd/root.go	60.43% <0.00%> (-3.85%)	⬇️
...cap/tiup/components/playground/instance/tiflash.go	61.29% <0.00%> (-2.49%)	⬇️
...om/pingcap/tiup/components/cluster/command/root.go	43.03% <0.00%> (-2.24%)	⬇️
.../pingcap/tiup/components/playground/instance/pd.go	75.43% <0.00%> (-1.23%)	⬇️
...pingcap/tiup/components/cluster/command/destroy.go	62.00% <0.00%> (-1.16%)	⬇️
... and 115 more

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