Allow setting credentials from node.run_state

[e100]

Forcing users to use data bags for credentials is too limiting.

Example use case:
In sentry wrapper cookbook:

1. Randomly generate credentials and store them using https://github.com/zuazo/chef-encrypted-attributes
2. Populate run_state with plain text values
   node.run_state["sentry_credentials"] = {........}
3. Include sentry recipe

in sentry::_configure I was thinking a minor edit like this:

if node.run_state["sentry_credentials"]               
  sentry_config = node.run_state["sentry_credentials"]
else                                                  
  sentry_config = data_bag_item(                      
    node["sentry"]["data_bag"],                       
    node["sentry"]["data_bag_item"]                   
  )                                                   
end      

If that would be acceptable or if you have a different idea please let me know and I will create a pull request.

[nilroy]

@e100 Sorry for this very late reply. You can use other methods. But please make sure that it can use encrypted and unencrypted databags also.. Please create a PR