Bug#986905: IPAccounting=yes does not work for systemd-run --user

[Ryutaroh Matsumoto]

Control: retitle -1 IPAccounting=yes does not work for systemd-run --user

A real inconvenience of 986905 is that IPAccounting does not work for
any process under systemd --user by non-root. For example,

ryutaroh at raspi4b8gb:~$ systemd-run --user --scope --unit=test -p "IPAccounting=yes" sh -c 'wget -O /dev/null http://www.debian.org/ ; sleep 100; exit 0' &
[1] 1821
Running scope as unit: test.scope
ryutaroh at raspi4b8gb:~$ systemctl --user status test.scope
● test.scope - /bin/sh -c wget -O /dev/null http://www.debian.org/ ; sleep 100; exit 0
     Loaded: loaded (/run/user/1000/systemd/transient/test.scope; transient)
  Transient: yes
     Active: active (running) since Fri 2021-04-16 13:00:05 JST; 21s ago
         IP: 0B in, 0B out
         IO: 696.0K read, 0B written
      Tasks: 2 (limit: 9028)
     Memory: 1.2M
        CPU: 123ms
     CGroup: /user.slice/user-1000.slice/user at 1000.service/app.slice/test.scope
             ├─1821 /bin/sh -c wget -O /dev/null http://www.debian.org/ ; sleep 100; exit 0
             └─1831 sleep 100

IP Accounting information is clearly incorrect above.
Is it expected to work???

Best regards, Ryutaroh