Rename config StateInfo() to MongoInfo() to better reflect the purpose of the method
Rename some more stateinfo attrs
Merge pull request #288 from wallyworld/rename-agent-stateinfo

Rename config StateInfo() to MongoInfo()

Agent config's StateInfo() method returns information for how to connect to mongo. There's also State() defined on Environs which returns api connection info. To avoid confusion, prepare for further refactoring, and better reflect the purpose of the method, it was renamed to MongoInfo()