pseq: Create Chassis class

Create a C++ Chassis class that corresponds to the JSON "chassis" object
in the config file.

Eventually more function will be added to this class, but for the
initial ver

pseq: Create Chassis class

Create a C++ Chassis class that corresponds to the JSON "chassis" object
in the config file.

Eventually more function will be added to this class, but for the
initial version only implement the required support for the JSON
properties.

Create automated test cases for the new class.

Tested:
* Ran automated test cases.

Change-Id: I66bd795f894b3376a5cb65294db7dbb6cf37e891
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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