add f5 as supported LB

[archerwu9425]

What this PR does / why we need it:
Add f5 to supportedLBProvider
Openstack api support f5 as LB provider, but OCCM will block at first place as f5 is not in the supported list.

Which issue this PR fixes(if applicable):
fixes #

Special notes for reviewers:

1. In OCCM cloud-config, add below setting:

[LoadBalancer]
lb-provider = f5

OCCM can start without error

2. Add LB service, openstack with f5 can create LB

Release note:

Add f5 to supportedLBProvider

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[kayrus]

@archerwu9425 thanks for the PR. Can you also adjust the https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/openstack-cloud-controller-manager/using-openstack-cloud-controller-manager.md accordingly?

[archerwu9425]

@kayrus Doc updated, please help review. Thanks

[kayrus]

/ok-to-test

[kayrus]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kayrus

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