GOBBLIN-1523: Change logging of live instances in Gobblin cluster to debug level

[sv2000]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-1523

Description

• Here are some details about my PR, including screenshots (if applicable):
  Currently, the live instances are logged at info level. This can result in a ton of uninformative logs in a production deployment, making debugging issues hard.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:
  Existing tests.

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.42%. Comparing base (44c7316) to head (e058e09).
⚠️ Report is 715 commits behind head on master.

Files with missing lines	Patch %	Lines
...ache/gobblin/cluster/GobblinHelixMultiManager.java	0.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3374      +/-   ##
============================================
- Coverage     46.43%   46.42%   -0.02%     
+ Complexity    10159    10156       -3     
============================================
  Files          2056     2056              
  Lines         80080    80081       +1     
  Branches       8947     8948       +1     
============================================
- Hits          37186    37177       -9     
- Misses        39448    39456       +8     
- Partials       3446     3448       +2     

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[autumnust]

+1