phase3: update to flannel 1.10

[neolit123]

the flannel version is k-a is outdated, this PR updates to the latest flannel - 0.10.0.

trying to solve:
https://k8s-testgrid.appspot.com/sig-network-gce#kubeadm-gce-cni-flannel

latest flannel doesn't work for me locally at all with 1.12.x and the guide here:
https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/#pod-network
i need to investigate further.

also, putting this PR on hold because i haven't tested it with k-a yet.

/hold
/kind bug
/area
/assign @fabriziopandini
@kubernetes/sig-cluster-lifecycle-pr-reviews
@kubernetes/sig-network-pr-reviews

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[fabriziopandini]

@neolit123 thanks for this PR!
Take your time for testing; I think we should hold any change to k/a until release cut + some days

[neolit123]

closing this because we are not going to maintain flannel in k-a:
kubernetes/test-infra#9539 (comment)

on a related note flannel is broken in 1.12 due to this:
flannel-io/flannel#1045

sadly, flannel itself is hardly maintained.

[ReSearchITEng]

For anyone willing to test the flannel fix for 1.12 further,
kubeadm -n kube-system apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml