monitor: Fill in EpowPowerOff action

This action does the following:

1) Starts a service mode timer, which would allow the system to be
   serviced before anything happens.
2) On the expiration of that timer, it will:
   a) Set the thermal fault alert D-Bus property.  This will be used
      to send an EPOW alert to the host on IBM systems.
   b) Start the meltdown timer.
3) On the expiration of the meltdown timer, a hard power off will
   occur.  This timer cannot be canceled even if fans start behaving.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I9434699b816b23b68c6d9d1e97283b4ab9befe4f
diff --git a/monitor/test/mock_power_interface.hpp b/monitor/test/mock_power_interface.hpp
index c070182..6801751 100644
--- a/monitor/test/mock_power_interface.hpp
+++ b/monitor/test/mock_power_interface.hpp
@@ -12,6 +12,7 @@
   public:
     MOCK_METHOD(void, softPowerOff, (), (override));
     MOCK_METHOD(void, hardPowerOff, (), (override));
+    MOCK_METHOD(void, thermalAlert, (bool), (override));
 };
 
 } // namespace phosphor::fan::monitor