test: remove "use-root" in functional_pass

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

test

@@ -111,7 +111,7 @@ function functional_pass {
 
 	for a in 1 2 3; do
 		mkdir -p ./agent-$a
-		./bin/etcd-agent -etcd-path ./bin/etcd -etcd-log-dir "./agent-$a" -port ":${a}9027" -use-root=false &
+		./bin/etcd-agent -etcd-path ./bin/etcd -etcd-log-dir "./agent-$a" -port ":${a}9027" &
 		pid="$!"
 		agent_pids="${agent_pids} $pid"
 	done