test: check criu restore with --auto-dedup

Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

test/zdtm.py

@@ -1105,6 +1105,9 @@ class criu:
 			r_opts += ['--empty-ns', 'net']
 			r_opts += ['--action-script', os.getcwd() + '/empty-netns-prep.sh']
 
+		if self.__dedup:
+			r_opts += ["--auto-dedup"]
+
 		self.__prev_dump_iter = None
 		criu_dir = os.path.dirname(os.getcwd())
 		if os.getenv("GCOV"):