resource_manager: default resource group's config is reset after restart pd server

[glorv]

Bug Report

What did you do?

Deploy a nightly pd server add execute:

Alter resource group default ru_per_sec = 1000000 background = (task_name = "br");

And then restart the pd server

What did you expect to see?

mysql> select * from information_schema.resource_groups;
+---------+------------+----------+-----------+-------------+-----------------+
| NAME    | RU_PER_SEC | PRIORITY | BURSTABLE | QUERY_LIMIT | BACKGROUND      |
+---------+------------+----------+-----------+-------------+-----------------+
| default | 1000000    | MEDIUM   | YES       | NULL        | TASK_NAMES='br' |
+---------+------------+----------+-----------+-------------+-----------------+

What did you see instead?

mysql> select * from information_schema.resource_groups;
+---------+------------+----------+-----------+-------------+------------+
| NAME    | RU_PER_SEC | PRIORITY | BURSTABLE | QUERY_LIMIT | BACKGROUND |
+---------+------------+----------+-----------+-------------+------------+
| default | UNLIMITED  | MEDIUM   | YES       | NULL        | NULL       |
+---------+------------+----------+-----------+-------------+------------+

What version of PD are you using (pd-server -V)?

[glorv]

/label affects-7.1

[glorv]

/label severity/major

[ti-chi-bot]

@glorv: The label(s) severity/major cannot be applied. These labels are supported: Hacktoberfest, challenge-program, ci-unstable, compatibility-breaker, high-performance, hptc, needs-cherry-pick-release-5.2, needs-cherry-pick-release-5.3, needs-cherry-pick-release-5.4, needs-cherry-pick-release-6.0, needs-cherry-pick-release-6.1, needs-cherry-pick-release-6.2, needs-cherry-pick-release-6.3, needs-cherry-pick-release-6.4, needs-cherry-pick-release-6.5, needs-cherry-pick-release-6.6, needs-cherry-pick-release-7.0, needs-cherry-pick-release-7.1, needs-cherry-pick-release-7.2, release-note, require-LGT1, wontfix, affects-5.2, affects-5.3, affects-5.4, affects-6.0, affects-6.1, affects-6.2, affects-6.3, affects-6.4, affects-6.5, affects-6.6, affects-7.0, affects-7.1, affects-7.2, may-affects-5.2, may-affects-5.3, may-affects-5.4, may-affects-6.0, may-affects-6.1, may-affects-6.2, may-affects-6.3, may-affects-6.4, may-affects-6.5, may-affects-6.6, may-affects-7.0, may-affects-7.1, may-affects-7.2.

In response to this:

/label severity/major

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