Clean datadirs before testing

Author: Toby McLaughlin

Makefile

@@ -40,6 +40,7 @@ all: build test
 
 # Test specified versions without building
 test: lint docker-compose
+	docker run --rm -v "$(PWD):/mnt" bash rm -rf /mnt/tests/datadir1 /mnt/tests/datadir2
 	$(foreach FLAVOR, $(IMAGE_FLAVORS), \
 	  pyfiglet -w 160 -f puffy "test: $(FLAVOR) single"; \
 	  ./bin/pytest --image-flavor=$(FLAVOR) --single-node tests; \