tools/functional-tester: update README for local docker testing

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

tools/functional-tester/scripts/tester.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+if ! [[ "$0" =~ "scripts/tester.sh" ]]; then
+  echo "must be run from tools/functional-tester"
+  exit 255
+fi
+
+docker run \
+  --rm \
+  --net=host \
+  --name tester \
+  gcr.io/etcd-development/etcd-functional-tester:go1.9.3 \
+  /bin/bash -c "/etcd-tester \
+    --agent-endpoints '127.0.0.1:19027,127.0.0.1:29027,127.0.0.1:39027' \
+    --client-ports 1379,2379,3379 \
+    --advertise-client-ports 13790,23790,33790 \
+    --peer-ports 1380,2380,3380 \
+    --advertise-peer-ports 13800,23800,33800 \
+    --stress-qps=2500 \
+    --stress-key-txn-count 100 \
+    --stress-key-txn-ops 10 \
+    --exit-on-failure"