执行yum install vconfig时老是报错：
https://vault.centos.org/centos/7/os/Source/repodata/repomd.xmlhttps://vault.cen
阅读背景：
CentOS 7.0 yum install 错误https://vault.centos.org/centos/7/os/Source/repodata/repomd.xml: [Errno 14]
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