Turn off python black formatting for the long line in dump_packages.py

Some of the roles use a line-length of 80 for black which does not
like this line, so tell black to ignore it.

callback_plugins/dump_packages.py

@@ -58,5 +58,7 @@ def v2_runner_on_ok(self, result):
                         packages.add(ii)
                 else:
                     packages.add(pkgs)
-
+            # tell python black that this line is ok
+            # fmt: off
             self._display.display("lsrpackages: " + " ".join(sorted(list(packages))))
+            # fmt: on