BPF: strip scope id when getting routes from {Open,Net,Free}BSD

[gpotter2]

• fixes Scope ids get embedded into IPv6 link-local addresses on OpenBSD, NetBSD and macOS #5033 -> we strip the scope id when getting the routes on OpenBSD/NetBSD/FreeBSD/darwin

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.22%. Comparing base (de33992) to head (06cc6a6).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5044      +/-   ##
==========================================
+ Coverage   80.13%   80.22%   +0.08%     
==========================================
  Files         388      388              
  Lines       96467    96473       +6     
==========================================
+ Hits        77308    77391      +83     
+ Misses      19159    19082      -77     

Files with missing lines	Coverage Δ
scapy/arch/bpf/pfroute.py	92.64% <100.00%> (+0.13%)	⬆️

... and 11 files with indirect coverage changes

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[evverx]

I printed conf.ifaces with this PR included and the scope ids are no longer embedded.

NetBSD: https://github.com/evverx/avahi/actions/runs/29538591476/job/87755650477?pr=3

Source  Index  Name    MAC                IPv4       IPv6                   
BPF     1      vioif0  52:54:00:12:34:56  10.0.2.15  fe80::5054:ff:fe12:3456
BPF     2      lo0     00:00:00:00:00:00  127.0.0.1  ::1                    
                                                     fe80::1                

OpenBSD: https://github.com/evverx/avahi/actions/runs/29538591476/job/87755650434?pr=3

Source  Index  Name    MAC                IPv4       IPv6                     
BPF     1      em0     52:54:00:12:34:56  10.0.2.15  fe80::5054:ff:fe12:3456  
                                                     fec0::dd27:a29:7b7b:4029 
                                                     fec0::70af:8863:a099:e28c
BPF     3      lo0     00:00:00:00:00:00  127.0.0.1  ::1                      
                                                     fe80::1                  
BPF     4      pflog0  00:00:00:00:00:00                                      

I also pulled it on a Mac and the scope ids aren't embedded there either. Packets it sends no longer include scope ids in the sense that the source is fe80::* instead of fe80:d::* on the receiving side.