playground: fix bug which can't specify db port

[hecomlilong]

What problem does this PR solve?

The command "tiup playground" can't specify db port even though customizing --db.config

What is changed and how it works?

When db port is specified, it will be passed by parameter -P in function of "NewTiDBInstance"

Check List

Tests

• Unit test
• Integration test

Code changes

NONE

Side effects
NONE

Related changes

• Need to cherry-pick to the release branch

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AstroProfundis

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[CLAassistant]

All committers have signed the CLA.

[AstroProfundis]

We are avoiding dependency upon tidb and other components by intend, please use general interface objects (map[string]interface{} with type assertion) to decode the config.

Or simply provide a command line argument in playground to specify TiDB port and overwrite the default.

[codecov-commenter]

Codecov Report

Merging #1511 (f32e266) into master (c12fd8e) will increase coverage by 29.90%.
The diff coverage is 60.00%.

@@             Coverage Diff             @@
##           master    #1511       +/-   ##
===========================================
+ Coverage   26.26%   56.17%   +29.90%     
===========================================
  Files         267      292       +25     
  Lines       24047    26222     +2175     
===========================================
+ Hits         6316    14730     +8414     
+ Misses      16908     9470     -7438     
- Partials      823     2022     +1199     

Flag	Coverage Δ
cluster	44.02% <ø> (?)
dm	26.27% <ø> (?)
integrate	50.74% <60.00%> (+34.69%)	⬆️
playground	13.75% <60.00%> (?)
tiup	16.04% <ø> (ø)
unittest	22.82% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
components/playground/instance/instance.go	51.72% <ø> (ø)
components/playground/main.go	45.71% <20.00%> (+43.34%)	⬆️
components/playground/instance/tidb.go	84.61% <100.00%> (ø)
components/playground/playground.go	49.22% <100.00%> (+49.22%)	⬆️
pkg/logger/logger.go	100.00% <0.00%> (ø)
components/playground/instance/pd.go	75.00% <0.00%> (ø)
pkg/cluster/operation/upgrade.go	59.48% <0.00%> (ø)
pkg/cluster/operation/telemetry.go	0.00% <0.00%> (ø)
components/dm/task/update_dm_meta.go	86.04% <0.00%> (ø)
... and 216 more

---

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[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: f32e266