codegen: resolve pylint import issues

Remove unused imports and reorder other imports so that
the standard ones are coming first.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

gio/gdbus-2.0/codegen/codegen_md.py

@@ -6,7 +6,6 @@
 import os
 import re
 
-from . import utils
 import textwrap
 
 # Disable line length warnings as wrapping the templates would be hard