Add function to load in the GPIO data from JSON.

Use the cJSON module to load in the GPIO definitions used by
the other skeleton code into a cJSON structure. Its memory
should be re

Add function to load in the GPIO data from JSON.

Use the cJSON module to load in the GPIO definitions used by
the other skeleton code into a cJSON structure. Its memory
should be released by calling cJSON_Delete on it when complete.

This is the first commit in a series that will move the GPIO
configuration data from D-Bus into a JSON file, which is both
more appropriate for read only data and the first step in
getting rid of the system_manager.py file that currently hosts it.

Change-Id: If1ef19e7988d28e3075828f61e88a606631bcd89
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

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