Docker: Partially split out kit item autodetection

Most of it is independent of the docker device as such, this should be
centralized somehow. This here is a first step.

Change-Id: If32063559a4c7c6c3cecf1973e1ef1f634e5f8f4
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/docker/dockerdevice.h

@@ -122,6 +122,24 @@ private:
     friend class DockerDeviceWidget;
 };
 
+class KitDetector : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit KitDetector(const ProjectExplorer::IDevice::ConstPtr &device);
+    ~KitDetector() override;
+
+    void autoDetect(const QString &sharedId) const;
+    void undoAutoDetect(const QString &sharedId) const;
+
+signals:
+    void logOutput(const QString &msg);
+
+private:
+    class KitDetectorPrivate *d = nullptr;
+};
+
 class DockerDeviceFactory final : public ProjectExplorer::IDeviceFactory
 {
 public: