feat(cluster): add option to control timeout on cluster slots refresh (#475)

* add option to control refresh slots timeout

* rename as per issue

* missed one

Author: damianhodgkiss

lib/cluster/index.js

@@ -35,6 +35,8 @@ var DelayQueue = require('./delay_queue');
  * if `retryDelayOnClusterDown` is valid delay time.
  * @param {number} [options.retryDelayOnTryAgain=100] - When a TRYAGAIN error is received, client will retry
  * if `retryDelayOnTryAgain` is valid delay time.
+ * @param {number} [options.slotsRefreshTimeout=1000] - The milliseconds before a timeout occurs while refreshing
+ * slots from the cluster.
  * @param {Object} [options.redisOptions] - Passed to the constructor of `Redis`.
  * @extends [EventEmitter](http://nodejs.org/api/events.html#events_class_events_eventemitter)
  * @extends Commander
@@ -103,7 +105,8 @@ Cluster.defaultOptions = {
   maxRedirections: 16,
   retryDelayOnFailover: 100,
   retryDelayOnClusterDown: 100,
-  retryDelayOnTryAgain: 100
+  retryDelayOnTryAgain: 100,
+  slotsRefreshTimeout: 1000
 };
 
 util.inherits(Cluster, EventEmitter);
@@ -609,7 +612,7 @@ Cluster.prototype.getInfoFromNode = function (redis, callback) {
 
     _this.connectionPool.reset(nodes);
     callback();
-  }, 1000));
+  }, this.options.slotsRefreshTimeout));
 };
 
 /**