Improve dualStack log

[manuelbuil]

Proposed Changes

When running dualStack you get the log:

level=info msg="The interface eth0 with ipv4 address 10.1.1.10 will be used by flannel"

Which can be confusing, especially if you are prioritizing IPv6 family.

This PR combines both log entries when we are in dualStack mode so that we get both IPFamilies in the log

Types of Changes

Bugfix

Verification

Testing

Deploy with dualStack cidr and you should see the new log

Linked Issues

#8797

User-Facing Change

Further Comments

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (bbafb86) 47.12% compared to head (70763d6) 47.87%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8798      +/-   ##
==========================================
+ Coverage   47.12%   47.87%   +0.74%     
==========================================
  Files         148      148              
  Lines       15674    15917     +243     
==========================================
+ Hits         7387     7620     +233     
+ Misses       7089     7061      -28     
- Partials     1198     1236      +38     

Flag	Coverage Δ
e2etests	47.05% <0.00%> (?)
inttests	38.97% <0.00%> (-5.63%)	⬇️
unittests	17.87% <0.00%> (+<0.01%)	⬆️

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

Files	Coverage Δ
pkg/agent/flannel/flannel.go	43.31% <0.00%> (+0.27%)	⬆️

... and 51 files with indirect coverage changes

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