Load options from JSON object provided argument

Basically load options from provided JSON object.... And load the json object from userdata bootup :)

This means we can provide a base64 encoded userdata string when declaring workerType in new AWS provisioner.
That way we can provide workerType by userdata string... We can also parameterize capacity and friends from worker type definition...

Note, that ideally we should load configurations from a file, like all the other components do, the use `nconf` and just load a file from userdata to overwrite default configs if needed. Then configuration outside AWS would also be easy.

I agree, that this isn't pretty, but it could be worse :)
(there is also a little hack in there to improve situation with loggly tags, which doesn't work so well, but this doesn't fix tagging issue)