baton-sdk should return a different error message if `--provisioning` is not set

[ggreer]

Right now if you try to provision something without the --provisioning flag, we error with "resource type does not have provisioner configured". It'd be nice if the error was something like "provisioning is not enabled. try running with --provisioning".

[kgibson-spotnana]

Overall the error messages could be fleshed out to help diagnosis. I implemented Revoke parameters incorrectly and did not match the ResourceProvisioner interface and wrestled with the same error message for a while before discovering my mistake.