We actually want salt-master processes in the same control group to be
terminated and this was only introduced to fix the 'minion upgrades
itself' problem, which applies to salt-minion, but not to salt-master.
This change was introduced in d288539 to fix#29295, which discusses the
need to include 'KillMode=process' for the salt-minion on Debian
systems.
Declaring After=syslog.target is unnecessary by now because syslog is
socket-activated and will therefore be started when needed. Thus remove
the obsolete syslog.target from the systemd service files.
Since service files might be used by many distros (arch, rpm-based,
gentoo, mindriva, mageia) I think it would be useful to symlink to
standard ones (and copy and edit them if differences are needed).
