Remove the_real_ip variable

[aledbf]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #4429

Special notes for your reviewer:

[aledbf]

/assign @ElvinEfendi

[codecov-io]

Codecov Report

Merging #4557 into master will increase coverage by 0.18%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #4557      +/-   ##
==========================================
+ Coverage   59.34%   59.52%   +0.18%     
==========================================
  Files          89       89              
  Lines        6823     6982     +159     
==========================================
+ Hits         4049     4156     +107     
- Misses       2338     2377      +39     
- Partials      436      449      +13

Impacted Files	Coverage Δ
internal/ingress/controller/config/config.go	97.16% <0%> (-1.42%)	⬇️
internal/ingress/controller/store/backend_ssl.go	45.2% <0%> (-1.67%)	⬇️
internal/ingress/sslcert.go	0% <0%> (ø)	⬆️
internal/ingress/metric/collectors/process.go	90.42% <0%> (+2.12%)	⬆️
internal/watch/file_watcher.go	84.61% <0%> (+3.84%)	⬆️
internal/net/ssl/ssl.go	59.41% <0%> (+8.31%)	⬆️

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[ElvinEfendi]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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