[occm]: support providers that do not require nodeports

[oblazek]

Add a new loadBalancer option ProviderRequiresNodeports which by default is true to keep the existing behavior but when set to false allows user to not have to allocate nodeports in case there is support by the loadbalancer provider.

This allows usage of services of type LoadBalancer with allocateLoadBalancerNodePorts=false in case provider like ours supports that. In our case we send traffic to our k8s nodes (in openstack) using ipip tunneling so there is no need to allocate nodeports.

occm: support providers that do not need nodeports

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Hi @oblazek. Thanks for your PR.

I'm waiting for a kubernetes 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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[oblazek]

added/fixed tests so that the defaults are overwritten when needed

[oblazek]

/test

[k8s-ci-robot]

@oblazek: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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In response to this:

/test

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