Limit resources for users CPU, RAM and test

[lux12337]

No description provided.

[moorepants]

It still isn't clear if this is properly working. Testing is still needed to see if users are limited if they request too many resources.

[rkevin-arch]

This is definitely working. We have resource constraints of 8GB memory and 4 CPU cores. Here's me stress testing memory, and the process got killed while it is at the 7GB memory mark, despite the host having 16GB of RAM:

Here's me stress testing CPU, while all cores are utilized the utilization didn't go to 100% (which it definitely would if 8 processes are in infinite loops):

[rkevin-arch]

In other news, we aren't limiting PIDs so we are vulnerable to a fork bomb, but #50 is already tracking that and I haven't found a good solution yet (there is a solution that involves setting pod-max-pids on all kubelets, but that involves screwing around with the config). I'll update that issue if I find anything.

[moorepants]

Sounds good. Thanks.