Use SSL in ELB API server health check

[johanneswuerbach]

This switch causes the ELB to perform a SSL handshake and makes the
I0427 03:57:55.059255 1 logs.go:41] http: TLS handshake error from IP:PORT: EOF
disappear from the apiserver logs.

Tested manually and everything looks ✅

Inspiration from kubernetes-retired/kube-aws#604

[k8s-ci-robot]

Hi @johanneswuerbach. Thanks for your PR.

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[johanneswuerbach]

/assign @justinsb

[chrislovecnm]

AWESOME

[chrislovecnm]

/approve no-issue
/lgtm
/ok-to-test

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrislovecnm, johanneswuerbach

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[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue