Optimize log when rootcoord goroutine quit

[longjiquan]

/kind improvement

[mergify[bot]]

@longjiquan E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[longjiquan]

/run-cpu-e2e

[codecov[bot]]

Codecov Report

Merging #23698 (98e3503) into master (4fb8919) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #23698   +/-   ##
=======================================
  Coverage   82.11%   82.11%           
=======================================
  Files         742      742           
  Lines       96994    96996    +2     
=======================================
+ Hits        79647    79649    +2     
- Misses      14378    14379    +1     
+ Partials     2969     2968    -1     

Impacted Files	Coverage Δ
internal/rootcoord/root_coord.go	80.22% <100.00%> (+0.01%)	:arrow_up:

... and 8 files with indirect coverage changes

[mergify[bot]]

@longjiquan E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[longjiquan]

/run-cpu-e2e

[mergify[bot]]

@longjiquan E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[longjiquan]

/run-cpu-e2e

[mergify[bot]]

@longjiquan E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[longjiquan]

/run-cpu-e2e

[czs007]

/approve /lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, longjiquan

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