sectionsd: retry getting eit_version

Sometimes at first start, the cn thread does not fetch the EIT version
and thus automatic updates don't work. The cause of this is not 100%
clear, for now let's add a workaround to try a bit longer fetching it.

src/eitd/eitd.h

@@ -244,6 +244,7 @@ class CCNThread : public CEventsThread
 	private:
 		/* overloaded hooks */
 		void addFilters();
+		bool shouldSleep();
 		void beforeSleep();
 		void beforeWait();
 		void afterWait();
@@ -254,6 +255,7 @@ class CCNThread : public CEventsThread
 		OpenThreads::Mutex update_mutex;
 		bool	updating;
 		cDemux * eitDmx;
+		int eit_retry;
 
 		void sendCNEvent();
 	public:

src/eitd/sectionsd.cpp

@@ -1599,6 +1599,23 @@ bool CEventsThread::addEvents()
 	return true;
 }
 
+bool CCNThread::shouldSleep()
+{
+	if (!scanning || channel_is_blacklisted)
+		return true;
+	if (!sendToSleepNow)
+		return false;
+	if (eit_version != 0xff)
+		return true;
+
+	if (++eit_retry > 1) {
+		xprintf("%s::%s eit_retry > 1 (%d) -> going to sleep\n", name.c_str(), __func__, eit_retry);
+		return true;
+	}
+	sendToSleepNow = false;
+	return false;
+}
+
 /* default check if thread should go to sleep */
 bool CEventsThread::shouldSleep()
 {
@@ -1672,6 +1689,7 @@ CCNThread::CCNThread()
 
 	updating = false;
 	eitDmx = new cDemux(0);
+	eit_retry = 0;
 }
 
 /* CN thread hooks */
@@ -1737,6 +1755,7 @@ void CCNThread::beforeSleep()
 		/* send a "no epg" event anyway before going to sleep */
 		sendCNEvent();
 	}
+	eit_retry = 0;
 }
 
 void CCNThread::processSection()