This includes updates to CI config, vendor files, etc.
I've hard-coded the k8s depedency at 1.13.4 to keep it inline with what
we currently have and to make sure a another run of `go mod tidy`
doesn't accidentally update it to an unexpected version.
Thanks to hectorj2f for carrying this along.
ocagent allows users to send traces out of VK to a "standard" external forwarder
(standard as in this is a format/protocol defined in the opencensus project).
This allows uers to implement metrics for whatever backend they want
without having to add it into VK directly.