Remove bay reference from zun/objects/container.py
Remove bay reference from zun/objects/container.py

Variable in file zun/objects/container.py still has bay in its
name. This patch changes the variable name appropriately.

Change-Id: Ideceae1048aaf198647bd2ef8f1b0e23afe856e8

kevin-zhaoshuai/zun,kevin-zhaoshuai/zun,kevin-zhaoshuai/zun