BGP: Fix IPv4 listen addr configuration

[BarbarossaTM]

Closes #450

[codecov-commenter]

Codecov Report

Merging #451 (9e214c6) into master (0e48eb2) will decrease coverage by 1.56%. Report is 2 commits behind head on master. The diff coverage is 82.35%.

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

@@            Coverage Diff             @@
##           master     #451      +/-   ##
==========================================
- Coverage   54.34%   52.79%   -1.56%     
==========================================
  Files         146      152       +6     
  Lines        7901     8160     +259     
==========================================
+ Hits         4294     4308      +14     
- Misses       3401     3646     +245     
  Partials      206      206              

Flag	Coverage Δ
unittests	52.79% <82.35%> (-1.56%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
net/tcp/listen.go	0.00% <0.00%> (ø)
net/tcp/tcpsock_posix.go	26.41% <87.50%> (ø)

... and 4 files with indirect coverage changes

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more