Set kube-proxy memory request to 50Mi

[jingyuanliang]

With optional override using KUBE_PROXY_MEMORY_REQUEST following the KUBE_PROXY_CPU_REQUEST pattern.

What type of PR is this?

/kind feature

What this PR does / why we need it:

When a container doesn't have requests, the scheduler assumes 100mCPU and 200Mi of memory for the purposes of node resources usage scoring. In some scenarios, this can throw off users who are expecting a certain level of bin-packing. With explicit resources requests, the behavior of the scheduler can be more predictable to users.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @jingyuanliang. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jingyuanliang]

/assign @aojea

[MrHohn]

/ok-to-test

[dims]

/approve
/lgtm

makes sense!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, jingyuanliang

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Needs approval from an approver in each of these files:

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: f24ea30b76a4b9f7bf128c026ca70cae5257279e

[jingyuanliang]

/retest