For each zone log sensor name with max setpoint

Add sensor name that has the maximum setpoint for a PID zone.
Log a debug message when the sensor is changed.
The name is also added to the log file for each log record.

Tested:
Override one CPU temperature sensor
busctl set-property xyz.openbmc_project.CPUSensor /xyz/openbmc_project/sensors/temperature/DTS_CPU1 xyz.openbmc_project.Sensor.Value Value d 82
Observed log message:
swampd[443]: PID Zone 0 max SetPoint 34.5546 requested by DTS_CPU1

Signed-off-by: Nirav Shah <nirav.j2.shah@intel.com>
Signed-off-by: Zhikui Ren <zhikui.ren@intel.com>
Change-Id: Ifc12cb9a106da1bf41dd35697210f74ba1b589db
diff --git a/test/zone_mock.hpp b/test/zone_mock.hpp
index bab77e3..dd98c15 100644
--- a/test/zone_mock.hpp
+++ b/test/zone_mock.hpp
@@ -19,7 +19,7 @@
     MOCK_METHOD0(initializeCache, void());
     MOCK_METHOD1(getCachedValue, double(const std::string&));
     MOCK_CONST_METHOD0(getRedundantWrite, bool(void));
-    MOCK_METHOD1(addSetPoint, void(double));
+    MOCK_METHOD2(addSetPoint, void(double, const std::string&));
     MOCK_METHOD0(clearSetPoints, void());
     MOCK_METHOD1(addRPMCeiling, void(double));
     MOCK_METHOD0(clearRPMCeilings, void());