Configure Loadbalancer back-end pool only for controlplane machines

[Karthik-K-N]

/kind bug
/area provider/ibmcloud

What steps did you take and what happened:
[A clear and concise description of what the bug is.]

Creating a IBMPowerVS cluster from cluster-template-powervs-create-infra.yaml template creates a Loadbalancer and configures all the machines of the cluster to its backend pool.

What did you expect to happen:

Only control plane machines should be configured to backendpool as 6443 is APIServer port and only control-plane machines will serve in that port.

Changes needs to be done:

1. Just skip configuring LB backend pool for data plane nodes here.
2. Utility function

available in capi repo for identifying machine as control-plane machine

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api version:
• Minikube/KIND version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[Karthik-K-N]

/good-first-issue

[k8s-ci-robot]

@Karthik-K-N:
This request has been marked as suitable for new contributors.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[carmal891]

/assign