Fix the name of default backend variable

[yasra002]

What this PR does / why we need it:

The name of variable for default backend is wrong. In _helpers.tpl its defined as ingress-nginx.defaultBackend.fullname where as in default-backend-hpa.yaml its called nginx-ingress.defaultBackend.fullname.

I get the following error when I try to enable autoscaling for default backend.

Error: template: ingress-nginx/templates/default-backend-hpa.yaml:8:20: executing "ingress-nginx/templates/default-backend-hpa.yaml" at <{{template "nginx-ingress.defaultBackend.fullname" .}}>: template "nginx-ingress.defaultBackend.fullname" not defined

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.

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[k8s-ci-robot]

Hi @yasra002. Thanks for your PR.

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[yasra002]

CLA signature done

[aledbf]

/ok-to-test

[aledbf]

@yasra002 please add a test for hpa in https://github.com/kubernetes/ingress-nginx/tree/master/charts/ingress-nginx/ci to avoid regressions.

[yasra002]

@yasra002 please add a test for hpa in https://github.com/kubernetes/ingress-nginx/tree/master/charts/ingress-nginx/ci to avoid regressions.

Hi @aledbf !

I have added the test. I am not sure if did it a right way or not. Do let me know if I missed something.

[aledbf]

@yasra002 please squash the commits.

[aledbf]

From the logs

2020-12-04T17:23:44.6477984Z 14s Warning FailedComputeMetricsReplicas horizontalpodautoscaler/ingress-nginx-r49d2hfict-defaultbackend horizontal-pod-autoscaler invalid metrics (2 invalid out of 2), first error is: failed to get memory utilization: unable to get metrics for resource memory: unable to fetch metrics from resource metrics API: the server could not find the requested resource (get pods.metrics.k8s.io) 45s 3 ingress-nginx-r49d2hfict-defaultbackend.164d93481059f44a

@yasra002 please remove the new test. Without the hpa the test will never pass. I leave that for another PR.

[aledbf]

/lgtm
/approve

[aledbf]

@yasra002 thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, yasra002

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