driver/power/poe_netgear_plus: Respect dynamic ports

[AiyionPrime]

in isolated mode.

Description

Checklist

• Documentation for the feature
• Tests for the feature

• The arguments and description in doc/configuration.rst have been updated

• Add a section on how to use the feature to doc/usage.rst

• Add a section on how to use the feature to doc/development.rst

• PR has been tested

• Man pages have been regenerated

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.4%. Comparing base (b666734) to head (cf6810d).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
labgrid/driver/power/poe_netgear_plus.py	40.0%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1836     +/-   ##
========================================
- Coverage    45.4%   45.4%   -0.1%     
========================================
  Files         177     177             
  Lines       13863   13866      +3     
========================================
+ Hits         6300    6301      +1     
- Misses       7563    7565      +2     

Flag	Coverage Δ
3.10	45.4% <40.0%> (-0.1%)	⬇️
3.11	45.4% <40.0%> (-0.1%)	⬇️
3.12	45.4% <40.0%> (-0.1%)	⬇️
3.13	45.4% <40.0%> (-0.1%)	⬇️
3.14	45.4% <40.0%> (-0.1%)	⬇️

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