Add --use-slaves to test invocation

Author: lantiga

opt/Makefile

@@ -134,7 +134,7 @@ ifneq ($(NO_LFS),1)
 endif
 	$(SHOW)set -e ;\
 	cd $(ROOT)/test ;\
-	python3 -m RLTest $(TEST_ARGS) --test basic_tests.py --module $(INSTALL_DIR)/redisai.so ;\
+	python3 -m RLTest $(TEST_ARGS) --test basic_tests.py --module $(INSTALL_DIR)/redisai.so --use-slaves ;\
 	python3 -m RLTest $(TEST_ARGS) --test  double-panda.py --module $(INSTALL_DIR)/redisai.so
 
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