`AESFuncs._pillar` can return `False`, handle that cleanly.
Document passing arguments with equal signs. Refs a1ba178d.

Add additional documentation regarding arguments passing with equal signs for which salt tries hard to turn into keyword arguments. The problem now arises because non supported arguments immediately thrown an exception.
Remove left behind debugging experience.
Arguments like `pip==1.0` must not match yaml'ification as as keyword arguments.
Reintroduce the removed grains information.

Removed on 4617a931be354f7e98a6999ed70d22cef70ed262 and 52be720d62cc601196f3405e090fb98511c86227.