Move dbus connection into base sensor object

This seems common through most sensors, might as
well move it for consistency.

Tested: sensors operational as normal

Change-Id: I4e6c55cbb7171ee51700015f8c2ef8c05c90fb4e
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/src/TachSensor.cpp b/src/TachSensor.cpp
index acfe659..d39e92c 100644
--- a/src/TachSensor.cpp
+++ b/src/TachSensor.cpp
@@ -53,7 +53,7 @@
                        const std::pair<size_t, size_t>& limits,
                        const PowerState& powerState) :
     Sensor(boost::replace_all_copy(fanName, " ", "_"), std::move(_thresholds),
-           sensorConfiguration, objectType, limits.second, limits.first,
+           sensorConfiguration, objectType, limits.second, limits.first, conn,
            powerState),
     objServer(objectServer), redundancy(redundancy),
     presence(std::move(presenceSensor)),