Remove unused variables and verbose e2e logs

test/e2e-image/Makefile

@@ -1,24 +1,8 @@
-.PHONY: all
-all: image
 
 DIR:=$(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
 
-# Use docker to run makefile tasks
-USE_DOCKER ?= true
-
-# Disable run docker tasks if running in prow.
-# only checks the existence of the variable, not the value.
-ifdef DIND_TASKS
-USE_DOCKER=false
-endif
-
-.PHONY: image
 image:
-ifeq ($(USE_DOCKER), true)
-	@$(DIR)/../../build/run-in-docker.sh make e2e-test-binary
-else
-	@make -C $(DIR)/../../ e2e-test-binary
-endif
+	make -C $(DIR)/../../ e2e-test-binary
 
 	cp $(DIR)/../e2e/e2e.test .
 	cp $(DIR)/../e2e/wait-for-nginx.sh .
@@ -30,7 +14,9 @@ endif
 	docker build \
 		--tag nginx-ingress-controller:e2e .
 
-.PHONY: clean
 clean:
 	rm -rf _cache e2e.test kubectl cluster ginkgo
 	docker rmi -f nginx-ingress-controller:e2e || true
+
+
+.PHONY: image clean