The flag is similar to --user flag as it causes systemctl to operate on
user units, but it performs operations globally for all users. This is
required for user presets support.
(From OE-Core rev: ab6476d28485598ae842472a7b15ca7bf244c776)
Signed-off-by: Artur Kowalski <arturkow2000@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>