Correctly format ipv6 resolver config for lua

[jacksontj]

It seems that when support was added for parsing resolv_conf directly a regression was introduced which effectively breaks anyone with ipv6 resolvers.

Regression of #3895

[k8s-ci-robot]

Hi @jacksontj. Thanks for your PR.

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[jacksontj]

/assign @aledbf

[jacksontj]

I have tested this on my ipv4 and ipv6-only clusters (done so by mounting the lua file over the existing one).

[aledbf]

/ok-to-test

[codecov-io]

Codecov Report

Merging #4543 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4543      +/-   ##
==========================================
+ Coverage   59.05%   59.06%   +0.01%     
==========================================
  Files          89       89              
  Lines        6811     6811              
==========================================
+ Hits         4022     4023       +1     
- Misses       2350     2351       +1     
+ Partials      439      437       -2

Impacted Files	Coverage Δ
internal/watch/file_watcher.go	80.76% <0%> (-3.85%)	⬇️
internal/ingress/metric/collectors/process.go	90.42% <0%> (+2.12%)	⬆️

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[aledbf]

/lgtm

[aledbf]

@jacksontj thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, jacksontj

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