Fix the bug that ctl working directory is different with TiUP

[lonng]

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

What problem does this PR solve?

Fix #584

[codecov-commenter]

Codecov Report

Merging #589 into master will increase coverage by 10.72%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #589       +/-   ##
===========================================
+ Coverage   39.84%   50.56%   +10.72%     
===========================================
  Files         201      219       +18     
  Lines       14847    15897     +1050     
===========================================
+ Hits         5916     8039     +2123     
+ Misses       8072     6738     -1334     
- Partials      859     1120      +261     

Flag	Coverage Δ
#coverage	50.56% <ø> (+10.72%)	⬆️

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%)	⬇️
...pingcap/tiup/components/cluster/command/destroy.go	60.37% <0.00%> (-2.79%)	⬇️
...cap/tiup/components/playground/instance/tiflash.go	61.29% <0.00%> (-2.49%)	⬇️
...om/pingcap/tiup/components/cluster/command/test.go	62.22% <0.00%> (-2.07%)	⬇️
...om/pingcap/tiup/components/cluster/command/root.go	43.39% <0.00%> (-1.88%)	⬇️
... and 123 more

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[ti-srebot]

@july2993,Thanks for your review.

[lucklove]

LGTM

[ti-srebot]

@lucklove,Thanks for your review.

[lucklove]

/merge

[ti-srebot]

/run-all-tests