[WIP] Add redfish SSL support

[slintes]

Depends on metal3-io/metal3-dev-env#1528

For TNF we need to have a SSL secured redfish endpoint. The PR mentioned above adds support for creation of private key and certificate, configuration of sushy, and configuration of ironic's redfish driver.

This PR adds setting certificate verification for the BMH, based on the redfish_verify_ca option in ironic nodes json.

[openshift-ci]

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[openshift-ci]

Hi @slintes. Thanks for your PR.

I'm waiting for a openshift-metal3 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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