By the time __systemctl is called, --user/--system are shifted out of
`words' by _arguments. This patch queries the array sooner.
In the case that both --user and --system are on the line when compsys runs,
_sys_service_mgr is set to the latter. Which is seemingly how systemctl behaves.
If neither are on the line, --system is set; for system services to be completed.
Eric Cook
68c4f6d406