allow dns-autoscaler requests to be specified via variables

[0x4c6565]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Allow the memory/cpu requests to be specified via variables dns_autoscaler_cpu_requests and dns_autoscaler_memory_requests

Which issue(s) this PR fixes:

Fixes #6019

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[floryut]

Thanks @0x4c6565
Can you sign CLA ?

/ok-to-test

[floryut]

@0x4c6565 Thank you, don't forget to sign CLA; otherwise all good.

/lgtm

[0x4c6565]

I've signed the CLA (work email address is attached to my Github account), however CI is failing :(

[floryut]

/retest

[0x4c6565]

/retest

[0x4c6565]

CLA sorted :)

[floryut]

CLA sorted :)

Great, sorry about that but could you rebase ? #6035 is merged and should fix the molecule job error on your PR

[0x4c6565]

CLA sorted :)

Great, sorry about that but could you rebase ? #6035 is merged and should fix the molecule job error on your PR

Done

[floryut]

CLA sorted :)

Great, sorry about that but could you rebase ? #6035 is merged and should fix the molecule job error on your PR

Done

Please recheck your git history looks like you are now shipping commits that shouldn't be there

[floryut]

/lgtm

[Miouge1]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 0x4c6565, Miouge1

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