Provide TLS Certificate to kubelet service status request

[clobrano]

This change enhances the security of the kubelet service request in the
control plane manager by providing a TLS certificate when making the
request.

• Provide a CertStorageReader to the Manager
• Re-use PrepareCredentials function from certificates package to create
  the proper certificates
• Change TLSConfig providing Certificates and setting InsecureSkipVerify
  to false

see https://issues.redhat.com/browse/ECOPROJECT-1421

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/test 4.14-openshift-e2e

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[clobrano]

wrong source branch