Description of problem:
I want to clean up BIND9 unit files. There is a service (two actually) that need to set up a chroot environment before starting the service. bind services Requires the unit for setting up the chroot. The service for setting up chroot has StopWhenUnneeded=yes so it is stopped (and chroot is cleaned up) if the service that started it stopped/crashed/failed while starting and there is no
other service that Requires it.

The problem is that currently with StopWhenUnneeded=yes the service for setting
up the chroot is not stopped even if there is nothing that Requires it (or any
weaker or different relationship).

Version-Release number of selected component (if applicable):
latest (systemd-204-9.fc19)

How reproducible:
always

Steps to Reproduce:
-bash-4.2# more /etc/systemd/system/test*
::::::::::::::
/etc/systemd/system/test.service
::::::::::::::
[Unit]
Description=aaa
Requires=testb.service

[Service]
Type=forking
ExecStart=/bin/sleep 50
TimeoutStartSec=3

::::::::::::::
/etc/systemd/system/testb.service
::::::::::::::
[Unit]
Description=aaa
StopWhenUnneeded=yes

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/echo hej
ExecStop=/bin/echo hou

-bash-4.2# systemctl status testb test
testb.service - aaa
    Loaded: loaded (/etc/systemd/system/testb.service; static)
    Active: inactive (dead)


test.service - aaa
    Loaded: loaded (/etc/systemd/system/test.service; static)
    Active: inactive (dead)

-bash-4.2# systemctl start test
Job for test.service failed. See 'systemctl status test.service' and 
'journalctl -xn' for details.

-bash-4.2# systemctl status testb test
testb.service - aaa
    Loaded: loaded (/etc/systemd/system/testb.service; static)
    Active: active (exited) since Thu 2013-07-18 15:34:34 CEST; 7s ago
   Process: 45 ExecStart=/bin/echo hej (code=exited, status=0/SUCCESS)

Jul 18 15:34:34 mycontainer systemd[1]: Starting aaa...
Jul 18 15:34:34 mycontainer systemd[1]: Started aaa.

test.service - aaa
    Loaded: loaded (/etc/systemd/system/test.service; static)
    Active: failed (Result: timeout) since Thu 2013-07-18 15:34:37 CEST; 
4s ago
   Process: 46 ExecStart=/bin/sleep 50 (code=killed, signal=TERM)

Jul 18 15:34:34 mycontainer systemd[1]: Starting aaa...
Jul 18 15:34:37 mycontainer systemd[1]: test.service operation timed 
out. Terminating.
Jul 18 15:34:37 mycontainer systemd[1]: Failed to start aaa.
Jul 18 15:34:37 mycontainer systemd[1]: Unit test.service entered failed 
state.

Actual results:
The service with StopWhenUnneeded=yes is NOT stopped if not needed.

Expected results:
The service with StopWhenUnneeded=yes is stopped if not needed.

Additional info:
http://lists.freedesktop.org/archives/systemd-devel/2013-July/012123.html
http://lists.freedesktop.org/archives/systemd-devel/2013-July/012141.html