dm: redirect stdout to log files

[csuzhangxc]

What problem does this PR solve?

save stdout as we did for stderr

What is changed and how it works?

redirect stdout to log files

Check List

Tests

• No code

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release notes:

NONE

[CLAassistant]

All committers have signed the CLA.

[csuzhangxc]

@july2993 PTAL

[codecov-commenter]

Codecov Report

Merging #815 into master will increase coverage by 1.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #815      +/-   ##
==========================================
+ Coverage   51.43%   52.78%   +1.34%     
==========================================
  Files         262      262              
  Lines       18971    18971              
==========================================
+ Hits         9758    10013     +255     
+ Misses       7657     7396     -261     
- Partials     1556     1562       +6     

Flag	Coverage Δ
#cluster	44.75% <100.00%> (+2.32%)	⬆️
#dm	25.23% <100.00%> (+0.06%)	⬆️
#integrate	47.80% <100.00%> (+1.76%)	⬆️
#playground	22.17% <ø> (ø)
#tiup	10.83% <100.00%> (ø)
#unittest	18.81% <100.00%> (ø)

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

Impacted Files	Coverage Δ
pkg/cluster/embed/autogen_pkger.go	100.00% <100.00%> (ø)
pkg/cluster/spec/prometheus.go	73.11% <0.00%> (+1.07%)	⬆️
pkg/cluster/spec/grafana.go	65.11% <0.00%> (+1.16%)	⬆️
pkg/cluster/spec/spec.go	89.38% <0.00%> (+1.22%)	⬆️
pkg/cluster/api/dmapi.go	58.26% <0.00%> (+1.73%)	⬆️
pkg/cluster/spec/alertmanager.go	64.81% <0.00%> (+1.85%)	⬆️
pkg/cluster/api/binlog.go	43.82% <0.00%> (+2.24%)	⬆️
pkg/cluster/task/builder.go	97.10% <0.00%> (+2.47%)	⬆️
pkg/cluster/api/pdapi.go	53.54% <0.00%> (+3.22%)	⬆️
pkg/cluster/manager.go	66.32% <0.00%> (+4.35%)	⬆️
... and 12 more

---

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[lonng]

/merge

[ti-srebot]

Your auto merge job has been accepted, waiting for:

• 817
• 816

[ti-srebot]

/run-all-tests

[ti-srebot]

@csuzhangxc merge failed.

[july2993]

@csuzhangxc pls resolve conflicts

[csuzhangxc]

@july2993 PTAL again

[july2993]

/merge