Backport changes for bootstrap config reference rotation into v1.4.x branch#21

AndiDog merged 2 commits intorelease-1.4giantswarm/cluster-api:release-1.4from

machine-pool-bootstrap-config-ref-rotation-based-on-1.4giantswarm/cluster-api:machine-pool-bootstrap-config-ref-rotation-based-on-1.4Copy head branch name to clipboard