set SCOPE_LOG_ROOT_PATH to /dev/null to avoid creating lots of logfiles

Author: Frank Shotwell

Makefile

@@ -3,6 +3,7 @@
 IMG ?= controller:latest
 export GO111MODULE=on
 export GOPROXY=https://proxy.golang.org
+export SCOPE_LOG_ROOT_PATH=/dev/null
 
 SHELL := /bin/bash -o pipefail
 VERSION_PACKAGE = github.com/replicatedhq/troubleshoot/pkg/version