call-swarm: avoid dummy call to create a conference

Now a conference can start without any call (this avoid to attach
a call without peer to create a conference).

Path is now clearer for a call creation:
+ If we receive a call, we attach it to the conference
+ Else we do not create any call and just attach the host.

Next step is to be able to attach a host in audio only without weird
tricks and group addParticipant/bindParticipant

GitLab: #953
Change-Id: I13785a5525e041c37fb62c0c9f355e9371f1e4ad

test/agent/src/bindings/signal.cpp

@@ -211,7 +211,7 @@ install_signal_primitives(void*)
     add_handler<libjami::CallSignal::RecordPlaybackFilepath, const std::string&, const std::string&>(
         handlers, "record-playback-filepath");
 
-    add_handler<libjami::CallSignal::ConferenceCreated, const std::string&, const std::string&>(
+    add_handler<libjami::CallSignal::ConferenceCreated, const std::string&, const std::string&, const std::string&>(
         handlers, "conference-created");
 
     add_handler<libjami::CallSignal::ConferenceChanged,

test/unitTest/call/conference.cpp

@@ -235,7 +235,7 @@ ConferenceTest::registerSignalHandlers()
             cv.notify_one();
         }));
     confHandlers.insert(libjami::exportable_callback<libjami::CallSignal::ConferenceCreated>(
-        [=](const std::string&, const std::string& conferenceId) {
+        [=](const std::string&, const std::string&, const std::string& conferenceId) {
             confId = conferenceId;
             cv.notify_one();
         }));