make the temp project key building method public

Author: FChataigner

dataikuapi/dss/app.py

@@ -39,14 +39,17 @@ def create_instance(self, instance_key, instance_name, wait=True):
         else:
             return future
 
+    def make_random_project_key(self):
+        return "%s_tmp_%s" % (self.app_id, random_string(10))
+
     def create_temporary_instance(self):
         """
         Creates a new temporary instance of this app.
         The return value should be used as a Python context manager. Upon exit, the temporary app
         instance is deleted
         :return a :class:`TemporaryDSSAppInstance`
         """
-        key = "%s_tmp_%s" % (self.app_id, random_string(10))
+        key = self.make_random_project_key()
         instance = self.create_instance(key, key, True)
         return TemporaryDSSAppInstance(self.client, key)