fix pd and dashboard address display issue in tiup-playground

[iosmanthus]

Signed-off-by: iosmanthus myosmanthustree@gmail.com

What problem does this PR solve?

In tidb mode, if the tidb starts then we can say the PDs must start. However, when in tikv-slim mode, there is an issue that tiup-playground won't print any information about PD, because it won't wait for any instance of PDs to really start.

What is changed and how it works?

1. Print dashboard's address only when there are some TiDB instances.
2. Always print PD's address.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Starting component `playground`: /home/iosmanthus/.tiup/components/playground/v1.5.1/tiup-playground --mode tikv-slim
Using the version v5.0.2 for version constraint "".

If you'd like to use a TiDB version other than v5.0.2, cancel and retry with the following arguments:
    Specify version manually:   tiup playground <version>
    Specify version range:      tiup playground ^5
    The nightly version:        tiup playground nightly

Playground Bootstrapping...
Start pd instance
Start tikv instance
PD client endpoints: [127.0.0.1:2379]
To view the Prometheus: http://127.0.0.1:39625
To view the Grafana: http://127.0.0.1:3000

Side effects

• Possible performance regression
• Increased code complexity

Related changes

• Need to cherry-pick to the release branch

Release notes:

display PD client endpoints in playground

[codecov-commenter]

Codecov Report

Merging #1428 (8cfd38e) into master (4e8f168) will increase coverage by 4.64%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1428      +/-   ##
==========================================
+ Coverage   25.40%   30.04%   +4.64%     
==========================================
  Files         264      276      +12     
  Lines       20631    21057     +426     
==========================================
+ Hits         5241     6327    +1086     
+ Misses      14586    13752     -834     
- Partials      804      978     +174     

Flag	Coverage Δ
integrate	21.74% <100.00%> (+6.25%)	⬆️
playground	13.76% <100.00%> (?)
tiup	15.48% <ø> (ø)
unittest	21.73% <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/playground.go	48.55% <100.00%> (+48.55%)	⬆️
components/playground/instance/ticdc.go	0.00% <0.00%> (ø)
components/playground/instance/tikv_config.go	100.00% <0.00%> (ø)
components/playground/instance/tiflash.go	59.09% <0.00%> (ø)
...onents/playground/instance/tiflash_proxy_config.go	81.81% <0.00%> (ø)
components/playground/instance/tikv.go	67.34% <0.00%> (ø)
components/playground/instance/instance.go	45.45% <0.00%> (ø)
components/playground/instance/drainer.go	0.00% <0.00%> (ø)
components/playground/instance/process.go	81.39% <0.00%> (ø)
components/playground/instance/tiflash_config.go	100.00% <0.00%> (ø)
... and 22 more

---

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[iosmanthus]

@AstroProfundis PTAL

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• AstroProfundis

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[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: 8cfd38e