Allow a forced update of the setup reader

When the network is down it can happen the bootstrap file request is not yet timed out but we use our own time out.
In that case we check the cached data upfront by faking a failed web read.

src/blackcore/setupreader.cpp

@@ -202,6 +202,11 @@ namespace BlackCore
         m_shutdown = true;
     }
 
+    void CSetupReader::forceAvailabilityUpdate()
+    {
+        this->manageSetupAvailability(false, false); // fake a failed web read
+    }
+
     void CSetupReader::readSetup()
     {
         const CStatusMessageList msgs(this->triggerReadSetup());