[v0.14.5] Flatcar migration for 0.14.x

[jorge07]

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[jorge07]

Result of e2e tests for our staging clusters in v0.14.3+dirty

➜ sonobuoy0165 results $results
Plugin: e2e
Status: failed
Total: 3585
Passed: 202
Failed: 2
Skipped: 3381

Failed tests:
[sig-network] Proxy version v1 should proxy logs on node using proxy subresource  [Conformance]
[sig-network] Proxy version v1 should proxy logs on node with explicit kubelet port using proxy subresource  [Conformance]

Plugin: systemd-logs
Status: passed
Total: 4
Passed: 4
Failed: 0
Skipped: 0

Minor and non related issues

[dominicgunn]

Thank you @jorge07!

[dominicgunn]

/lgtm