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.h

@@ -149,6 +149,10 @@ namespace BlackCore
         //! \threadsafe
         bool isSetupAvailable() const { return m_setupAvailable; }
 
+        //! Force an availability update
+        //! \remark check for cached setup if the read check never got triggered
+        void forceAvailabilityUpdate();
+
         //! Version info available?
         //! \threadsafe
         bool isUpdateInfoAvailable() const { return m_updateInfoAvailable; }