Added advertise address integration test

[vitorsavian]

Proposed Changes

Integration test for ---advertise-address flag

Types of Changes

Integration test

Verification

sudo go test ./tests/integration/advertise/... -run Integration

Testing

Linked Issues

• [Epic] Add Integration Test for all server/agent flags #6057

User-Facing Change

Further Comments

[dereknola]

There is no need to make a individual test for a single flag, this is why we have the startup test https://github.com/k3s-io/k3s/blob/master/tests/integration/startup/startup_int_test.go#L84. You should expand the existing testlet which is already creating and cleaning up dummy interfaces.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (cae8b2b) 44.66% compared to head (7702d49) 51.46%.
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8344      +/-   ##
==========================================
+ Coverage   44.66%   51.46%   +6.79%     
==========================================
  Files         143      143              
  Lines       14746    15229     +483     
==========================================
+ Hits         6587     7837    +1250     
+ Misses       7119     6171     -948     
- Partials     1040     1221     +181     

Flag	Coverage Δ
e2etests	48.63% <100.00%> (?)
inttests	44.73% <66.66%> (+2.77%)	⬆️
unittests	19.84% <33.33%> (+0.01%)	⬆️

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

Files	Coverage Δ
pkg/daemons/executor/executor.go	57.81% <ø> (ø)
pkg/etcd/etcd.go	44.88% <100.00%> (+9.20%)	⬆️

... and 49 files with indirect coverage changes

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