presence: Parse JSON input file

Load, parse, and store the JSON configuration data to be used in
populating the fan presence policies.

Tested:
    Valid json file is parsed without error
    Invalid json file throws exception

Change-Id: Ib5e28533177ece31620877a6e146ce61025b4fb3
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
1 file changed