Improve Agitator

A recent comment from @dlmarion about possible improvements to Agitator:
"I think we could make the scripts more modular, reuse some code, and maybe include other types of failure. For example, the old Netflix Chaos Monkey scripts use Linux host commands to introduce various things into the environment - high CPU / IO usage, packet loss, packet latency, packet corruption, bad routing, etc."
https://github.com/Netflix/SimianArmy/tree/master/src/main/resources/scripts