[FFE] Simple client tool

Currently if logind has not set up the user's delegated cgroups, the user must do

      for d in $(grep -v ^# /proc/cgroups | awk '{print $1}'); do
                dbus-send --print-reply --address=unix:path=/sys/fs/cgroup/cgmanager/sock \
                        --type=method_call /org/linuxcontainers/cgmanager org.linuxcontainers.cgmanager0_0.Create \
                        string:$d string:$TUSER >/dev/null

                dbus-send --print-reply --address=unix:path=/sys/fs/cgroup/cgmanager/sock \
                        --type=method_call /org/linuxcontainers/cgmanager org.linuxcontainers.cgmanager0_0.Chown \
                        string:$d string:$TUSER int32:$(id -u $TUSER) int32:$(id -g $TUSER) >/dev/null

                dbus-send --print-reply --address=unix:path=/sys/fs/cgroup/cgmanager/sock \
                        --type=method_call /org/linuxcontainers/cgmanager org.linuxcontainers.cgmanager0_0.MovePid \
                        string:$d string:$TUSER int32:$$ >/dev/null
        done

Upstream cgmanager has a client script 'cgm' which allows this to be done with

sudo cgm create all $TUSER
sudo cgm chown all $TUSER $(id -u $TUSER) $(id -g $TUSER)
cgm movepid all $TUSER $$

It would be nice to get this program into the trusty package.