b/f: cleaner shutdown of registration timer thread

apps/db_reg_agent/DBRegAgent.cpp

@@ -550,6 +550,7 @@ void DBRegAgent::process(AmEvent* ev) {
       DBG("Session received system Event\n");
       if (sys_ev->sys_event == AmSystemEvent::ServerShutdown) {
 	running = false;
+	registration_scheduler._timer_thread_running = false;
       }
       return;
     }

apps/db_reg_agent/RegistrationTimer.cpp

@@ -203,7 +203,9 @@ void RegistrationTimer::run()
   gettimeofday(&now, NULL);
   timeradd(&tick,&now,&next_tick);
 
-  while(true){
+  _timer_thread_running = true;
+
+  while(_timer_thread_running){
 
     gettimeofday(&now,NULL);
 

apps/db_reg_agent/RegistrationTimer.h

@@ -108,6 +108,7 @@ class RegistrationTimer
 				time_t to_time);
 
   RegistrationTimer(); 
+  bool _timer_thread_running;
 };
 
 #endif