Merge pull request #1 from LCTT/master

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Update 20140819 Linux Systemd--Start or Stop or Restart Services in RHEL or CentOS 7.md
Translated:20140819 Linux Systemd--Start or Stop or Restart Services in RHEL or CentOS 7.md
Merge pull request #1528 from GOLinux/master

Translated:20140819 Linux Systemd--Start or Stop or Restart Services in RHEL or CentOS 7.md