resolve container and env vars (pod information) from PID

[dustin-decker]

For events identified by PID we need to resolve it back to container, pod, and namespace, and any other context passed down that we want to send.

https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/
https://stackoverflow.com/questions/24406743/coreos-get-docker-container-name-by-pid