Only enable IPv6 on loadbalancer container when the service is ipv6

[aojea]

Fixes: #111

[k8s-ci-robot]

@aojea: The following test 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-cloud-provider-kind-conformance-parallel-ipv6	e2f51e4	link	false	/test pull-cloud-provider-kind-conformance-parallel-ipv6

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[aojea]

Kubernetes e2e suite: [It] [sig-network] LoadBalancers ExternalTrafficPolicy: Local [Feature:LoadBalancer] [Slow] should handle updates to ExternalTrafficPolicy field expand_less

the test failure is a known issue, unrelated to this PR

[BenTheElder]

/retest

[BenTheElder]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, BenTheElder

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[BenTheElder]

hmm @aojea probably some more of these presubmits should be marked required?

[aojea]

hmm @aojea probably some more of these presubmits should be marked required?

Indeed