Add callback manager

Callback manager sets up matches and sets properties on
dbus.

Tested: used sensor override to make sensors assert
critical and warning interfaces and saw led change. also
caugh

Add callback manager

Callback manager sets up matches and sets properties on
dbus.

Tested: used sensor override to make sensors assert
critical and warning interfaces and saw led change. also
caught a few buggy threshold settings using led.

Change-Id: I06c164b749febbc3e81cb3db5f7a0a2b72b3678f
Signed-off-by: James Feist <james.feist@linux.intel.com>

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