Use make test for ecs-agent tests

Author: amogh09

Makefile

@@ -148,6 +148,8 @@ endif
 test:
 	cd agent && GO111MODULE=on ${GOTEST} ${VERBOSE} -tags unit -mod vendor -coverprofile ../cover.out -timeout=120s ./... && cd ..
 	go tool cover -func cover.out > coverprofile.out
+	cd ecs-agent && GO111MODULE=on ${GOTEST} ${VERBOSE} -tags unit -mod vendor -coverprofile ../cover.out -timeout=120s ./... && cd ..
+	go tool cover -func cover.out > coverprofile-ecs-agent.out
 
 test-init:
 	go test -count=1 -short -v -coverprofile cover.out ./ecs-init/...