Updates to Energy Plus Agent

[davidraker]

Backport of changes to modular EnergyPlusAgent.

• Allows this code to work with configuration files of the style supported by the version of the agent in volttron-pnnl-applications (inputs and outputs may now be dict of dicts or list of dicts).
• Updates json configuration to current property names and makes file locations consistent in both configuration files.
• Fixes assignment to an object variable in the agent which is actually part of the integration class.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Agent was installed and started using both json and yaml configuration files packaged with the agent. It was confirmed to run and generate periodic publishes for both configurations.