Fix proxy protocol support for X-Forwarded-Port

[djboris9]

This PR fixes issue #4951 by using the $proxy_protocol_server_port value
as X-Forwarded-Port, when Proxy Protocol is enabled.

What this PR does / why we need it:

• The nginx.tmpl was changed to assign $proxy_protocol_server_port as pass_server_port
  value when Proxy Protocol is enabled.
• lua_ingress.lua had to be adjusted in order not to overwrite pass_server_port as it's already set in nginx.tmpl.
• The Proxy Protocol E2E test was updated to validate the correct X-Forwarded-Port.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Which issue/s this PR fixes

fixes #4951

How Has This Been Tested?

Ran the E2E test suite and testet it in our lab environment with Proxy Protocol enabled and disabled.
https was only tested without TLS passthrough on our lab.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

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Hi @djboris9. Thanks for your PR.

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[djboris9]

I signed it

[djboris9]

/assign @aledbf

[aledbf]

/ok-to-test

[codecov-io]

Codecov Report

Merging #4956 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #4956      +/-   ##
=========================================
+ Coverage   58.48%   58.5%   +0.01%     
=========================================
  Files          88      88              
  Lines        6728    7119     +391     
=========================================
+ Hits         3935    4165     +230     
- Misses       2363    2497     +134     
- Partials      430     457      +27

Impacted Files	Coverage Δ
internal/ingress/metric/collectors/socket.go	79.12% <0%> (+0.15%)	⬆️
internal/ingress/controller/template/template.go	79.97% <0%> (+0.36%)	⬆️
cmd/nginx/main.go	6.91% <0%> (+0.42%)	⬆️
internal/ingress/types_equals.go	20.72% <0%> (+3.23%)	⬆️
internal/ingress/controller/nginx.go	33.2% <0%> (+3.51%)	⬆️
internal/ingress/annotations/opentracing/main.go	63.15% <0%> (+9.31%)	⬆️

---

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[aledbf]

/retest

[aledbf]

@djboris9 just in case the failures are not related to your change

[djboris9]

/retest

[djboris9]

/retest

[aledbf]

This variable is available since NGINX v1.17.6

[aledbf]

/lgtm
/approve

[aledbf]

@djboris9 thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, djboris9

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Needs approval from an approver in each of these files:

• OWNERS [aledbf]

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