Added http_proxy to the helm chart

[clarkdoan]

Is this a bug fix or adding new feature?
This PR adds the ability of setting proxy variables. Mimics the EBS CSI Driver's implementation.

What is this PR about? / Why do we need it?
Closes #409

What testing is done?
This was tested by upgrading a release and by creating a new release.

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[wongma7]

/ok-to-test
/check-cla

[wongma7]

/check-cla

[danielwegener]

@clarkdoan Any objections to sign the CLA? :) We would really benefit from this change.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[danielwegener]

Unfortunately @clarkdoan does not seem to be available. Would it be (process-wise) possible if I handed in his commit+fix in a different PR?

[wongma7]

/retest

[wongma7]

looks like the EBS implementation changed with its 2.x.x helm chart release:

https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/master/charts/aws-ebs-csi-driver/values.yaml#L59

I'm OK With merging this as is given how long it took to review, I can submit a follow-up to make it consistent with the latest EBS implementation.

/lgtm

[danielwegener]

@wongma7 sounds good for me :)

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/lifecycle stale

[k8s-ci-robot]

@clarkdoan: PR needs rebase.

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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[msnelling]

@wongma7 any updates to this issue?

[MageshSrinivasulu]

@wongma7 @danielwegener Is the issue fixed and do we have the proxy added to the helm chart?