[Release 1.31] Add int test for flannel-ipv6masq

[manuelbuil]

Backport: #10440

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.29%. Comparing base (9ae2c39) to head (8523112).
Report is 2 commits behind head on release-1.31.

❗ There is a different number of reports uploaded between BASE (9ae2c39) and HEAD (8523112). Click for more details.

HEAD has 24 uploads less than BASE

Flag	BASE (9ae2c39)	HEAD (8523112)
unittests	2	1
inttests	20	10
e2etests	13	0

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.31   #10904      +/-   ##
================================================
- Coverage         49.82%   41.29%   -8.54%     
================================================
  Files               178      178              
  Lines             14777    14777              
================================================
- Hits               7363     6102    -1261     
- Misses             6072     7507    +1435     
+ Partials           1342     1168     -174     

Flag	Coverage Δ
e2etests	?
inttests	36.74% <ø> (+17.03%)	⬆️
unittests	13.57% <ø> (ø)

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