S3UTILS-228: allow custom repd port in check-replication-permissions

[nicolas2bert]

On 3-server rings, vault repd instances share hosts and bind to incremental ports (4300, 4301, …). The script had port 4300 hard-coded, so it silently connected to a follower when the leader was on another port, causing "Role not found in vault" for every bucket.

• Parse argv[3] as ip[:port], default port to 4300 when omitted
• Export parseLeaderAddress and add unit tests
• Update README: CLI table, workflow examples, troubleshooting

[bert-e]

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[bert-e]

Incorrect fix version

The Fix Version/s in issue S3UTILS-228 contains:

• None

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

• 1.17.6

• 1.18.0

Please check the Fix Version/s of S3UTILS-228, or the target
branch of this pull request.

[claude]

LGTM

Review by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.16%. Comparing base (fa6161a) to head (2169cb2).

Additional details and impacted files

@@                 Coverage Diff                  @@
##           development/1.17     #382      +/-   ##
====================================================
+ Coverage             44.12%   44.16%   +0.04%     
====================================================
  Files                    88       88              
  Lines                  6448     6453       +5     
  Branches               1348     1349       +1     
====================================================
+ Hits                   2845     2850       +5     
  Misses                 3555     3555              
  Partials                 48       48              

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