Docker: add option to disable file path mapping

Can be used to easily reproduce the current windows state that has no
way to map the remote file system to a local path on other systems like
linux.

Change-Id: I32cd1852dd0b4fc0890a503c244f34065c29e18c
Reviewed-by: hjk <hjk@qt.io>

src/plugins/docker/dockerdevice.h

@@ -44,6 +44,7 @@ public:
     QString tag;
     QString size;
     bool useLocalUidGid = true;
+    bool useFilePathMapping = true;
     QStringList mounts;
 };