util: use short ln options for Busybox compat

If the host systems run Busybox, long options may be disabled. Switch to
the short options but comment them for readability.

Remove the pylint comment as a bonus since the line is no longer to
long!

Signed-off-by: Paul Spooren <mail@aparcar.org>

Author: aparcar

labgrid/util/managedfile.py

@@ -74,9 +74,9 @@ def sync_to_resource(self, symlink=None):
                     conn.run_check(f"test ! -e {symlink} -o -L {symlink}")
                 except ExecutionError:
                     raise ManagedFileError(f"Path {symlink} exists but is not a symlink.")
-                conn.run_check(
-                    f"ln --symbolic --force --no-dereference {self.rpath}{os.path.basename(self.local_path)} {symlink}"  # pylint: disable=line-too-long
-                )
+                # use short options to be compatible with busybox
+                # --symbolic --force --no-dereference
+                conn.run_check(f"ln -sfn {self.rpath}{os.path.basename(self.local_path)} {symlink}")
 
 
     def _on_nfs(self, conn):