Increase instance creation time from 10 to 15 minutes as instance creation...

Increase instance creation time from 10 to 15 minutes as instance creation time includes its frontend creation which can take sometime a longer than usual time.

erp5/util/testnode/SlapOSMasterCommunicator.py

@@ -119,7 +119,7 @@ class SlapOSMasterCommunicator(object):
 
   @retryOnNetworkFailure
   def isInstanceRequested(self, instance_title):
-    return len(self.hateoas_navigator._getHostingSubscriptionList(
+    return len(self.hateoas_navigator._getInstanceTreeList(
         title=instance_title))
 
   @retryOnNetworkFailure
@@ -132,7 +132,7 @@ class SlapOSMasterCommunicator(object):
 
   @retryOnNetworkFailure
   def getInstanceUrlList(self):
-    return self.hateoas_navigator.getHostingSubscriptionInstanceList(
+    return self.hateoas_navigator.getInstanceTreeInstanceList(
       self.name)
 
   @retryOnNetworkFailure