fix dhcp iteration

[T3pp31]

Checklist:

• If you are new to Scapy: I have checked CONTRIBUTING.md (esp. section submitting-pull-requests)
• I squashed commits belonging together
• I added unit tests or explained why they are not relevant
• I executed the regression tests (using tox)
• If the PR is still not finished, please create a Draft Pull Request

fixes #4836

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.88%. Comparing base (b673424) to head (2f719ca).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4837   +/-   ##
=======================================
  Coverage   80.87%   80.88%           
=======================================
  Files         368      368           
  Lines       90242    90244    +2     
=======================================
+ Hits        72987    72993    +6     
+ Misses      17255    17251    -4     

Files with missing lines	Coverage Δ
scapy/layers/dhcp.py	82.91% <100.00%> (+0.10%)	⬆️

... and 7 files with indirect coverage changes

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[T3pp31]

Implementing an iterator in RandDHCPOptions in scapy/layers/dhcp.py will prevent fuzz(DHCP()).show() from crashing with TypeError: ‘RandDHCPOptions’ object is not iterable. Specifically, add the following method to the class definition:

def __iter__(self):
    return iter(self._fix())

(If necessary, delegate getitem to return the result of _fix() as well. This ensures stable behavior even when index access is used repeatedly.)

DHCPOptionsField.i2repr() and i2m() process values sequentially, so if RandDHCPOptions has an iterator, it can be handled directly.

[gpotter2]

Thanks for the PR ! LGTM.