Add energy base scenario and test files

Add energy base scenario and test files

Folder of energy contains scripts of energy measurement.
File __init__.py make it a module that can be imported.
File energy.py contains the main function of energy measurement
through redfish API.
File test_energy.py test function of energy.py
File energy_sample_chassis_output.txt provide a sample output of
chassis query.
File energy_sample_power_metrics.txt provide sample metrics of
power query.
This will allow users to collect data of energy consumption of
baremetal machines.

JIRA: YARDSTICK-1624
Co-authored by: Roland Picard <roland.picard@orange.com>

Signed-off-by: sungn <sungn2@lenovo.com>
Change-Id: Ied86894f3dcc2536f0cb1a044f4591351e5b3270