Add support for Calico CNI "host-local" IPAM plugin

[bmelbourne]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Add support for the Calico CNI host-local IPAM plugin to allow pods to be created with the correct subnet IPs from the Calico CNI podCIDR range assigned to K8s nodes.

e.g.
/etc/cni/net.d/10-calico.conflist

...
      "ipam": {
        "type": "host-local",
        "subnet": "usePodCidr"
      },
...

$ kubectl get nodes k8s-2 -ojsonpath='{.spec.podCIDR}{"\n"}'
10.233.66.0/24

$ kubectl get nodes k8s-3 -ojsonpath='{.spec.podCIDR}{"\n"}'
10.233.65.0/24

$ kubectl get nodes k8s-4 -ojsonpath='{.spec.podCIDR}{"\n"}'
10.233.67.0/24

$ k run nginx --image=nginx --replicas=6
default       nginx-76df748b9-69zdg                         1/1     Running   0          19s     10.242.66.7    k8s-2   <none>           <none>
default       nginx-76df748b9-b94rh                         1/1     Running   0          19s     10.242.66.8    k8s-2   <none>           <none>
default       nginx-76df748b9-f9wqq                         1/1     Running   0          19s     10.242.65.9    k8s-3   <none>           <none>
default       nginx-76df748b9-qk26k                         1/1     Running   0          19s     10.242.65.10   k8s-3   <none>           <none>
default       nginx-76df748b9-86p47                         1/1     Running   0          19s     10.242.67.8    k8s-4   <none>           <none>
default       nginx-76df748b9-98r76                         1/1     Running   0          19s     10.242.67.9    k8s-4   <none>           <none>

Which issue(s) this PR fixes:
Fixes #5231

Special notes for your reviewer:
There are also some minor changes to correctly format the Calico CNI configuration file.

Does this PR introduce a user-facing change?:

Add support for Calico CNI `host-local` IPAM plugin

[k8s-ci-robot]

Hi @bmelbourne. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[bmelbourne]

/assign @ant31

[floryut]

@bmelbourne same here, please cleanup your git history

[bmelbourne]

/ok-to-test

[bmelbourne]

@ant31
All of the CI tests are now passing.

[EppO]

/lgtm

[Miouge1]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bmelbourne, Miouge1

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