fixed issue #801 , support canal docker

docker/image/admin/health.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+CHECK_URL="http://127.0.0.1:8080/metrics"
+CHECK_POINT="success"
+CHECK_COUNT=`curl -s --connect-timeout 7 --max-time 7 $CHECK_URL | grep -c $CHECK_POINT`
+if [ $CHECK_COUNT -eq 0 ]; then
+    echo "[FAILED]"
+    status=0
+	error=1
+else
+    echo "[  OK  ]"
+    status=1
+	error=0
+fi