Auto agent dependencies

[ripienaar]

Auto agent watchers should be able to express a depenency on another ones state, for example if 2 watchers are active in the same state they should be able to depend on the other one being in a specific state.

The example is machines manager, there's a KV get and a machines manage, but KV get is obviously going to take a bit of time, machines manage fail immediately. machines manage must be able to wait for KV get to be in success state