错误信息：
Another app is currently holding the yum lock; waiting for it to exit… The other application is: yum Memory : 125 M RSS (1.3 GB VSZ) Started: Sun Jul 8 08:48:46 2018 - 03:43 ago State : Running, pid: 898
强制关掉yum进程：
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Another app is currently holding the yum lock; waiting for it to exit… The other application is: yum Memory : 125 M RSS (1.3 GB VSZ) Started: Sun Jul 8 08:48:46 2018 - 03:43 ago State : Running, pid: 898
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