【x86】sp3降级到sp2时groff与groff-base报文件冲突

环境：sp2环境

验证步骤：
1、只挂sp3源：
http://121.36.84.172/dailybuild/openEuler-20.03-LTS-SP3/test_openeuler-2021-11-25-06-31-07/everything/
安装sp3的包

2、回退：
开启sp2的源：
https://repo.openeuler.org/openEuler-20.03-LTS-SP2/everything/
https://repo.openeuler.org/openEuler-20.03-LTS-SP2/OS/
执行dnf downgrade降级

报错现象：
```
file /usr/bin/eqn from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/groff from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/grops from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/grotty from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/pic from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/post-grohtml from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/pre-grohtml from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/preconv from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/soelim from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/tbl from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
  file /usr/bin/troff from install of groff-1.22.4-6.oe1.x86_64 conflicts with file from package groff-base-1.22.4-8.oe1.x86_64
```

src-openEuler/groff

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src-openEuler/groff .gitee-modal { width: 500px !important; }

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