Fix redis cluster health check

libraries/redis-wrapper/index.coffee

@@ -1,4 +1,5 @@
 _ = require("underscore")
+async = require "async"
 
 module.exports = RedisSharelatex =
 	createClient: (opts = {port: 6379, host: "localhost"})->
@@ -35,7 +36,7 @@ module.exports = RedisSharelatex =
 	
 	clusterHealthCheckBuilder: (client) ->
 		healthCheck = (callback) ->
-			jobs = client.rclient.nodes("all").map (node) =>
+			jobs = client.nodes("all").map (node) =>
 				(cb) => RedisSharelatex._checkClient(node, cb)
 			async.parallel jobs, callback
 		

libraries/redis-wrapper/package.json

@@ -6,6 +6,7 @@
   "author": "ShareLaTeX",
   "license": "ISC",
   "dependencies": {
+    "async": "^2.4.0",
     "chai": "1.9.1",
     "coffee-script": "1.8.0",
     "grunt": "0.4.5",