MT#63171 SIPRegistrarClient: facilitate shutdown

Use AmEventQueueThread so that the thread can shut down when requested
to.

Change-Id: I5021fb25a689d3cc00882a5b3776c8421aa02357

apps/registrar_client/SIPRegistrarClient.cpp

@@ -60,7 +60,7 @@ SIPRegistrarClient* SIPRegistrarClient::instance()
 }
 
 SIPRegistrarClient::SIPRegistrarClient(const string& name)
-  : AmEventQueue(this),
+  : AmEventQueueThread(this),
     uac_auth_i(NULL),
     AmDynInvokeFactory(MOD_NAME)
 { 

apps/registrar_client/SIPRegistrarClient.h

@@ -41,8 +41,7 @@ using std::string;
 struct SIPNewRegistrationEvent;
 class SIPRemoveRegistrationEvent;
 
-class SIPRegistrarClient  : public AmThread,
-			    public AmEventQueue,
+class SIPRegistrarClient  : public AmEventQueueThread,
 			    public AmEventHandler,
 			    public AmDynInvoke,
 			    public AmDynInvokeFactory