PXD-2396 ⁃ configure fence to use sidecar

[philloooo]

Similar to peregrine:

• https://github.com/uc-cdis/cloud-automation/blob/master/kube/services/peregrine/peregrine-deploy.yaml
• https://github.com/uc-cdis/cloud-automation/tree/master/Docker/sidecar
• https://github.com/uc-cdis/peregrine/blob/master/dockerrun.sh

Note that fence currently uses Apache internally, thank to its support for a SAML client for dbgap authentication, but most of our commons don't need that, so we should be able to run fence in sidecar mode with the nginx sidecar for most commons, and run without the sidecar in commons that need the SAML mod.  That's one way to do it anyway.