Dont use raw string for config var name

Author: vanyarock01

config.lua

@@ -546,6 +546,7 @@ local function etcd_load( M, etcd_conf, local_cfg )
 
 	local local_cache_needed = etcd_conf.local_cache
 	local local_cache_used   = false
+	local local_cache_var    = '\0moonlibs.config.etcd_cache'
 
 	function M.etcd.get_common(e)
 		local common_cfg = e:list(prefix .. "/common")
@@ -595,7 +596,7 @@ local function etcd_load( M, etcd_conf, local_cfg )
 	end
 
 	function M.etcd.get_all_from_cache(e)
-		return rawget(_G, '\0moonlibs.config.etcd_cache')
+		return rawget(_G, local_cache_var)
 	end
 
 	local ok, discovery_err = pcall(etcd.discovery, etcd)
@@ -613,7 +614,7 @@ local function etcd_load( M, etcd_conf, local_cfg )
 	else
 		all_cfg = etcd:get_all()
 		if local_cache_needed then
-			rawset(_G, '\0moonlibs.config.etcd_cache', all_cfg)
+			rawset(_G, local_cache_var, all_cfg)
 		end
 	end