manipulate network service in %post (#1369794)
    
    Due to #1369794 , anaconda cannot currently manipulate sysv
    services in F25+. So to work around this, take 'network' out of
    the services lines in all kickstarts and instead manipulate
    it in the %post section, with chkconfig.
    
    Also remove rsyslog from the Atomic image services line because
    it doesn't appear to be included in the OStree tree at present
    and so attempting to enable the service breaks Atomic image
    compose, see e.g.:
    
    https://kojipkgs.fedoraproject.org//work/tasks/9022/15349022/oz-x86_64.log
    
    also correct the name of the ssh service in fedora-arm-base.ks;
    it's sshd not ssh.