Fixes #3317 allowing to spawn flannel on all nodes in the cluster

[BradErz]

No description provided.

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[BradErz]

/assign @justinsb @chrislovecnm

[justinsb]

/lgtm

/ok-to-test

This looks good, but if you want this to apply to existing clusters we need to bump the manifest version in bootstrapchannelbuilder.go. But that can be done in a separate PR.

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BradErz, justinsb

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[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue