Add e2e tests for Client-Body-Buffer-Size

[diazjf]

Adds test cases for the client-body-buffer-size annotation.

[codecov-io]

Codecov Report

Merging #2727 into master will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2727      +/-   ##
==========================================
- Coverage    41.1%   40.96%   -0.14%     
==========================================
  Files          72       72              
  Lines        5085     5085              
==========================================
- Hits         2090     2083       -7     
- Misses       2707     2713       +6     
- Partials      288      289       +1

Impacted Files	Coverage Δ
cmd/nginx/main.go	22.62% <0%> (-5.11%)	⬇️

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[aledbf]

/lgtm
/approve

[aledbf]

@diazjf thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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