Fixes typo in named sed and chkconfig override for centos 7 only, doesn't work with 6.5 as systemctl gives command not found.
Merge pull request #7 from zVPS/master

Fixes typo in named sed and chkconfig override for centos 7 only

I'll have to move back the fi because Ubuntu does not know nor need chkconfig : the install of the service put them on autostart too.