bump etcd and flannel to the latest versions to get multiarch images for arm64 support

[pothos]

A number of kola tests fail because on arm64 we don't have etcd and flannel working due to using an image tag by default that isn't a multiarch image.

things to keep in mind:

• etcd now defaults to v3 - I guess this is something we'd like to communicate for people using etcd shipped by Flatcar (we can also update the etcd-member.service to keep V2 support and let users doing the upgrade)
• flannel and locksmith does not support etcd/v3: we need to start etcd with --enable-v2 + use ETCDCTL_API=2 (there is an on-going effort to port locksmith to v3: upgrade to etcd/client/v3 flatcar/locksmith#12)

How to use

The new image tags used here are multiarch images and it should work to pass the kola tests on arm64 with them.

Testing done

CI: http://jenkins.infra.kinvolk.io:8080/job/os/job/manifest/3368/cldsv/
amd64: 🔵
arm64: 🔴 it only remains the kubeadm.* test to pass; which should be quite trivial to fix I hope (see: flatcar/Flatcar#474)

[tormath1]

@pothos for the failing tests Error: unknown command "cluster-health" for "etcdctl", we can first start by prefixing the etcdctl command with ETCDCTL_API=2 in order to keep using V2 APIs.

Once merged, we can open an issue to track everything related to etcd/v3 upgrade with:

• kola test update
• locksmithctl update (already in progress)
• ...

[pothos]

@tormath1 Should I squash and merge or do you want to do it?

[tormath1]

@pothos feel free to do it :)

[pothos]

Thanks for taking over