sensor-mon: Threshold alarm logger framework

Add the new class ThresholdAlarmLogger that will watch the Warning,
Critical, and PerformanceLoss sensor threshold D-Bus interfaces and
create event logs when their alarm properties set and clear.

This commit just creates the class with its three sdbusplus match
objects to watch those interfaces.

Change-Id: I67c629bcabe059952c2029dc034daace9b88f051
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
5 files changed