Add retries for dns in tcp e2e test

[aledbf]

What this PR does / why we need it:

Fixes random e2e failures like
https://prow.k8s.io/view/gcs/kubernetes-jenkins/logs/ci-ingress-nginx-e2e/1242099773025030144

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

How Has This Been Tested?

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.

[ElvinEfendi]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [ElvinEfendi,aledbf]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[codecov-io]

Codecov Report

Merging #5283 into master will increase coverage by 0.03%.
The diff coverage is 67.64%.

@@            Coverage Diff             @@
##           master    #5283      +/-   ##
==========================================
+ Coverage   58.58%   58.61%   +0.03%     
==========================================
  Files          88       88              
  Lines        6879     6901      +22     
==========================================
+ Hits         4030     4045      +15     
- Misses       2407     2412       +5     
- Partials      442      444       +2     

Impacted Files	Coverage Δ
internal/ingress/controller/controller.go	49.40% <ø> (ø)
internal/ingress/annotations/modsecurity/main.go	61.11% <50.00%> (-1.39%)	⬇️
internal/ingress/annotations/rewrite/main.go	50.00% <57.14%> (+1.61%)	⬆️
cmd/nginx/flags.go	83.08% <66.66%> (+0.76%)	⬆️
internal/ingress/controller/template/template.go	80.10% <75.00%> (+0.02%)	⬆️
internal/ingress/controller/nginx.go	29.72% <100.00%> (+0.10%)	⬆️

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