Add example use of --openshift-ca argument

[JustinKuli]

We ran into the problem we think is described in #73, and found this as a workaround.

If the default ingress certificate is changed in the cluster, then the OpenShift OAuth server certificate might no longer be trusted by default. However, assuming the certificate was changed with this procedure (link), then OpenShift will add the new certificate to a bundle which we can mount into the container (more info on that process here (link).

This PR adds a section describing this configuration in the README, and adds it to the example sidecar configuration.

[openshift-ci-robot]

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[openshift-ci-robot]

Hi @JustinKuli. Thanks for your PR.

I'm waiting for a openshift 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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[JustinKuli]

/assign @deads2k

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