Add new slots readyReadStandardOutput/Error and finished to get messages

from included update_psa-script.

update.h

@@ -6,6 +6,7 @@
 #include <QFile>
 #include <QDir>
 #include <QByteArray>
+#include <QProcess>
 
 #include "plugins/interfaces.h"
 
@@ -79,5 +80,11 @@ private:
     bool updateDeviceConf(QString jsFileToSendToDC);
     bool downloadJson(enum FileTypeJson type, int templateIdx,
                       QString jsFileToSendToDC) const;
+
+private slots:
+    void readyReadStandardOutput();
+    void readyReadStandardError();
+    void finished(int exitCode, QProcess::ExitStatus exitStatus);
+
 };
 #endif // UPDATE_H_INCLUDED