presence: Create ErrorReporter class

This class will, eventually, create event logs for missing fans.

This first commit will just create a stubbed out class if there is a
'reporting' section in the configuration JSON.  From the JSON, the class
will pull out the value for the number of seconds to wait between first
detecting a fan is missing and creating the event log for it.

This requires a slight change to the existing JSON format, however the
JsonConfig class was updated to support both the old and new formats.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I991ea7cf0457448411e65f4c8e274bb2584d15f4
6 files changed