Don't set ConnectDelay to zero

src/IRCNetwork.cpp

@@ -991,6 +991,7 @@ bool CIRCNetwork::Connect() {
 		return false;
 
 	if (CZNC::Get().GetServerThrottle(pServer->GetName())) {
+		// Can't connect right now, schedule retry later
 		CZNC::Get().AddNetworkToQueue(this);
 		return false;
 	}

src/znc.cpp

@@ -2009,6 +2009,10 @@ protected:
 };
 
 void CZNC::SetConnectDelay(unsigned int i) {
+	if (i < 1) {
+		// Don't hammer server with our failed connects
+		i = 1;
+	}
 	if (m_uiConnectDelay != i && m_pConnectQueueTimer != NULL) {
 		m_pConnectQueueTimer->Start(i);
 	}
@@ -2057,7 +2061,6 @@ void CZNC::AddNetworkToQueue(CIRCNetwork *pNetwork) {
 		}
 	}
 
-
 	m_lpConnectQueue.push_back(pNetwork);
 	EnableConnectQueue();
 }