Egress filtering for terminal environment

[jamonation]

Is your feature request related to a problem? Please describe.
The terminal environment doesn't have any real restrictions on egressing traffic.

Describe the solution you'd like
An HTTP/HTTPS proxy, accessed via environment variables for pods that point to a sidecar pod-based service in the same namespace.

Describe alternatives you've considered
A standalone gateway VM with firewall rules.

Additional context
This suggestion came out of a discussion about the terminal environment and a quick, try to break it session, with @jedsalazar earlier in the week. This proxy configuration will be a quick and important improvement to the overall security of the environment.