✨ Add loadbalancer monitor configuration

[oscr]

What this PR does / why we need it:

Draft for implementing #1221 "Configurable api server loadbalancer monitor". Looking for general feedback, will this work, is there anything important missing, etc.

Documentation will be added when implementation is done.

Will of just extending the Test_ReconcileLoadBalancer unit test to also cover this bcase. Ok?

One of the comments in the was about aligning with CPI. Which I kind of did in spirit. For example monitor-delay is called delay and configured in the optional struct Monitor.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1221

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squashed commits
• if necessary:
  • includes documentation
  • adds unit tests

/hold

[k8s-ci-robot]

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-triage-robot]

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[jichenjc]

/ok-to-test

[k8s-ci-robot]

@oscr: PR needs rebase.

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@oscr: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-openstack-build	abb96e4	link	true	/test pull-cluster-api-provider-openstack-build
pull-cluster-api-provider-openstack-test	abb96e4	link	true	/test pull-cluster-api-provider-openstack-test
pull-cluster-api-provider-openstack-e2e-test	abb96e4	link	true	/test pull-cluster-api-provider-openstack-e2e-test

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[mnaser]

for whoever is reviewing this, keep in mind #1375 and the related issues too