feat: ingressgateway logs show up in `cf logs` [sidecar version]

[KauzClay]

In our PR, we use fluent-bit as a sidecar instead of as a daemonset (which was done in the previous draft here). We have deployed to a cf-for-k8s cluster and it works 🎉

We used cf-k8s-logging-fluent's fluent-bit dockerfile to build the fluent-bit images.

Note, istio-ingressgateways do not have an Istio sidecar so we needed to add a PeerAuthentication to all plaintext traffic to fluentd; this is not ideal.

#173568724

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/174346381

The labels on this github issue will be updated when the story is started.

[jenspinney]

LGTM 👍

[mike1808]

@KauzClay please merge