Update grafana.ini.tpl

[rkazak]

For issue #999
Modified as suggested to ensure that grafana uses a '.../log' directory.

What problem does this PR solve?

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• breeswish

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[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: cdb7e3d

[ti-chi-bot]

@rkazak: Your PR was out of date, I have automatically updated it for you.

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[codecov-io]

Codecov Report

Merging #1276 (9a1b166) into master (e60f822) will increase coverage by 22.98%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1276       +/-   ##
===========================================
+ Coverage   26.21%   49.19%   +22.98%     
===========================================
  Files         263      289       +26     
  Lines       18899    20852     +1953     
===========================================
+ Hits         4955    10259     +5304     
+ Misses      13172     8962     -4210     
- Partials      772     1631      +859     

Flag	Coverage Δ
cluster	38.47% <ø> (?)
dm	26.60% <ø> (?)
integrate	43.54% <ø> (+27.02%)	⬆️
playground	3.10% <ø> (?)
tiup	16.52% <ø> (ø)
unittest	22.74% <ø> (ø)

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

Impacted Files	Coverage Δ
pkg/cluster/operation/download.go	36.84% <0.00%> (ø)
components/playground/instance/tidb.go	0.00% <0.00%> (ø)
pkg/cluster/operation/operation.go	69.56% <0.00%> (ø)
components/playground/instance/pump.go	0.00% <0.00%> (ø)
pkg/cluster/operation/systemd.go	0.00% <0.00%> (ø)
...onents/playground/instance/tiflash_proxy_config.go	0.00% <0.00%> (ø)
pkg/cluster/operation/upgrade.go	57.79% <0.00%> (ø)
pkg/logger/audit.go	53.33% <0.00%> (ø)
components/playground/instance/drainer.go	0.00% <0.00%> (ø)
components/dm/task/update_dm_meta.go	85.29% <0.00%> (ø)
... and 180 more

---

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