Allow the lifecycle of kube-proxy to be managed independently of the …

[varunmar]

…startup scripts for GCE

Introduces a new env variable KUBE_PROXY_DISABLE which causes the configure scripts to skip over
the creation of both static pods as well as daemonset addons for kube-proxy.
When false, the behavior falls back to the default today, which is to rely on the value of
KUBE_PROXY_DAEMONSET to decide whether to start static pods on the nodes or an addon on the
master.

/kind feature

What this PR does / why we need it:
This allows the management of kube-proxy (lifetime and version) to be optionally decoupled from the

Does this PR introduce a user-facing change?:
Yes, a new environment variable is available to cluster creators.

Introduces a new GCE specific cluster creation variable KUBE_PROXY_DISABLE. When set to true, this will skip over the creation of kube-proxy (whether the daemonset or static pod). This can be used to control the lifecycle of kube-proxy separately from the lifecycle of the nodes.

[k8s-ci-robot]

Hi @varunmar. 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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[varunmar]

/assign bowei
/assign mrhohn

[MrHohn]

/ok-to-test

[varunmar]

/retest

[varunmar]

/retest

[varunmar]

/test pull-kubernetes-integration

[varunmar]

PTAL again. Fixed some spacing in the bash if statement :)

[MrHohn]

Sorry for the delay, this looks good to me. Much easier to have a direct env that controls the behavior.
/lgtm

[nikhita]

@bowei 👋 can you approve?

[bowei]

/lgtm
/approve

[varunmar]

/retest

[MrHohn]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bowei, MrHohn, varunmar

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Needs approval from an approver in each of these files:

• cluster/gce/OWNERS [bowei]

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[varunmar]

/retest