fix(adasvc): fix issue where limitation not updates

[justxuewei]

What this PR does:

• concurrency is renamed to maxCapacity
• fix the way calculating the value of maxCapacity
• limitation is not updated as expectation

Which issue(s) this PR fixes:
Fixes #

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[codecov-commenter]

Codecov Report

Merging #1784 (b7134f9) into 3.0 (e1c2a8f) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head b7134f9 differs from pull request most recent head febe6fb. Consider uploading reports for the commit febe6fb to get more accurate results

@@            Coverage Diff             @@
##              3.0    #1784      +/-   ##
==========================================
- Coverage   47.60%   47.57%   -0.04%     
==========================================
  Files         262      262              
  Lines       15114    15114              
==========================================
- Hits         7195     7190       -5     
- Misses       7134     7142       +8     
+ Partials      785      782       -3     

Impacted Files	Coverage Δ
cluster/loadbalance/p2c/loadbalance.go	76.36% <ø> (ø)
remoting/etcdv3/listener.go	45.13% <0.00%> (-1.77%)	⬇️
metrics/prometheus/reporter.go	26.85% <0.00%> (-1.72%)	⬇️

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