Allow setting LeaderID in controller manager options

[vincepri]

What steps did you take and what happened:
Running CAPI in the same namespace with CAPA or CABPK results in leader election errors. More details kubernetes-retired/cluster-api-bootstrap-provider-kubeadm#271

/kind bug
/priority important-soon
/assign
/lifecycle active
/cc @noamran

[k8s-ci-robot]

@vincepri: The provided milestone is not valid for this repository. Milestones in this repository: [Next, v0.1.x, v0.2.x, v0.3.0]

Use /milestone clear to clear the milestone.

In response to this:

What steps did you take and what happened:
Running CAPI in the same namespace with CAPA or CABPK results in leader election errors. More details kubernetes-retired/cluster-api-bootstrap-provider-kubeadm#271

/kind bug
/milestone v0.4.x
/priority important-soon
/assign
/lifecycle active
/cc @noamran

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[vincepri]

/milestone v0.2.x