sdbusplus: Provide option to skip signal property

InterfacesAdded signal itself will send out all propety
details and it's values during start-up of a D-Bus daemon service.
Sending properties changed signal confuses the signal handler
as it can't differentiate between service restart or real
property change event. Exposing a way to skip sending
properties changed signal during initialize (to avoid
breaking any old one).

Tested-by:
1. Verified that when initialize(true) is called, properties
changed signal are not sent out from D-Bus daemon
2. Still old method works fine.

Change-Id: Ib436ea9313b08623d931c58b11a770081511ab72
Signed-off-by: Richard Marian Thomaiyar <richard.marian.thomaiyar@linux.intel.com>

sdbusplus/asio/object_server.hpp

@@ -674,7 +674,7 @@ class dbus_interface
         return sd_bus_error_set_const(error, SD_BUS_ERROR_INVALID_ARGS, NULL);
     }
 
-    bool initialize()
+    bool initialize(const bool skipPropertyChangedSignal = false)
     {
         // can only register once
         if (initialized_)
@@ -690,9 +690,12 @@ class dbus_interface
             this);
         conn_->emit_interfaces_added(path_.c_str(),
                                      std::vector<std::string>{name_});
-        for (const std::string& name : propertyNames_)
+        if (!skipPropertyChangedSignal)
         {
-            signal_property(name);
+            for (const std::string& name : propertyNames_)
+            {
+                signal_property(name);
+            }
         }
         return true;
     }