Defer emitting InterfacesAdded signal until ready

Signed-off-by: Rashmica Gupta <rashmica.g@gmail.com>
Change-Id: I36b93db80fd6ff593288d107b06afd81dc1e2762
diff --git a/virtualSensor.hpp b/virtualSensor.hpp
index 6107fa1..c28e547 100644
--- a/virtualSensor.hpp
+++ b/virtualSensor.hpp
@@ -82,7 +82,7 @@
      */
     VirtualSensor(sdbusplus::bus::bus& bus, const char* objPath,
                   const Json& sensorConfig, const std::string& name) :
-        ValueObject(bus, objPath),
+        ValueObject(bus, objPath, action::defer_emit),
         bus(bus), name(name)
     {
         initVirtualSensor(sensorConfig, objPath);