Initial proposal to differentiate sam only and sat only tests

Now tests can use decorators to run/skip tests basead on server modes:
- runIf('sam') - runs only on sam server
- runIf('sat') - runs only on sat server
- no decoractor - runs on all server modes
I think @elyezer has a point. I immediately thought of the unittest library upon seeing the `runIf` name. Something a little more distinct and obvious would be great.