juju.agents.unit upstart jobs for a subordinate service are not removed when the service is destroyed

[Liam Young]

When destroying a subordinate service the juju.agents.unit upstart jobs are not removed from the machine.

I'm using the openstack provider and 0.6.0.1+bzr614-0juju2~quantal1 on the client and 0.6.0.1+bzr614-0juju2~precise1 on the vms.

To replicate:
juju bootstrap
juju deploy local:dummy-website
juju deploy local:nrpe-external-master
juju set nrpe-external-master "nagios_master=127.0.0.1"
juju add-relation dummy-website nrpe-external-master

# Upstart jobs for dummy-website and nrpe-external-master as expected
juju ssh 1 "ps -ef | grep juju; ls -l /etc/init/juju*"

root 28061 1 0 09:23 ? 00:00:00 python -m juju.agents.machine --nodaemon --logfile /var/log/juju/machine-agent.log --session-file /var/run/juju/machine-agent.zksession
root 28084 1 0 09:23 ? 00:00:01 /usr/bin/python -m juju.agents.unit --nodaemon --logfile /var/lib/juju/units/dummy-website-0/charm.log --session-file /var/run/juju/unit-dummy-website-0-agent.zksession
root 28168 1 0 09:28 ? 00:00:00 /usr/bin/python -m juju.agents.unit --nodaemon --logfile /var/lib/juju/units/nrpe-external-master-0/units/nrpe-external-master-0/charm.log --session-file /var/run/juju/unit-nrpe-external-master-0-agent.zksession
ubuntu 32456 32455 0 09:32 ? 00:00:00 bash -c ps -ef | grep juju; ls -l /etc/init/juju*
ubuntu 32458 32456 0 09:32 ? 00:00:00 grep juju
-rw-r--r-- 1 root root 601 Feb 4 09:23 /etc/init/juju-dummy-website-0.conf
-rw-r--r-- 1 root root 379 Feb 4 09:23 /etc/init/juju-machine-agent.conf
-rw-r--r-- 1 root root 727 Feb 4 09:28 /etc/init/juju-nrpe-external-master-0.conf

juju destroy-service dummy-website
juju destroy-service nrpe-external-master

# dummy-website jobs have gone but nrpe-external-master remains
juju ssh 1 "ps -ef | grep juju; ls -l /etc/init/juju*"

root 28061 1 0 09:23 ? 00:00:00 python -m juju.agents.machine --nodaemon --logfile /var/log/juju/machine-agent.log --session-file /var/run/juju/machine-agent.zksession
root 28168 1 0 09:28 ? 00:00:00 /usr/bin/python -m juju.agents.unit --nodaemon --logfile /var/lib/juju/units/nrpe-external-master-0/units/nrpe-external-master-0/charm.log --session-file /var/run/juju/unit-nrpe-external-master-0-agent.zksession
ubuntu 32577 32576 0 09:33 ? 00:00:00 bash -c ps -ef | grep juju; ls -l /etc/init/juju*
ubuntu 32579 32577 0 09:33 ? 00:00:00 grep juju
-rw-r--r-- 1 root root 379 Feb 4 09:23 /etc/init/juju-machine-agent.conf
-rw-r--r-- 1 root root 727 Feb 4 09:28 /etc/init/juju-nrpe-external-master-0.conf

juju deploy local:dummy-website
juju deploy local:nrpe-external-master
juju set nrpe-external-master "nagios_master=127.0.0.1"
juju add-relation dummy-website nrpe-external-master

# Now we have 2 dummy-website upstart jobs
juju ssh 1 "ps -ef | grep juju; ls -l /etc/init/juju*"

ubuntu 467 466 0 09:36 ? 00:00:00 bash -c ps -ef | grep juju; ls -l /etc/init/juju*
ubuntu 469 467 0 09:36 ? 00:00:00 grep juju
root 28061 1 0 09:23 ? 00:00:00 python -m juju.agents.machine --nodaemon --logfile /var/log/juju/machine-agent.log --session-file /var/run/juju/machine-agent.zksession
root 28168 1 0 09:28 ? 00:00:00 /usr/bin/python -m juju.agents.unit --nodaemon --logfile /var/lib/juju/units/nrpe-external-master-0/units/nrpe-external-master-0/charm.log --session-file /var/run/juju/unit-nrpe-external-master-0-agent.zksession
root 32588 1 0 09:34 ? 00:00:00 /usr/bin/python -m juju.agents.unit --nodaemon --logfile /var/lib/juju/units/dummy-website-1/charm.log --session-file /var/run/juju/unit-dummy-website-1-agent.zksession
root 32623 1 1 09:35 ? 00:00:00 /usr/bin/python -m juju.agents.unit --nodaemon --logfile /var/lib/juju/units/nrpe-external-master-1/units/nrpe-external-master-1/charm.log --session-file /var/run/juju/unit-nrpe-external-master-1-agent.zksession
-rw-r--r-- 1 root root 601 Feb 4 09:34 /etc/init/juju-dummy-website-1.conf
-rw-r--r-- 1 root root 379 Feb 4 09:23 /etc/init/juju-machine-agent.conf
-rw-r--r-- 1 root root 727 Feb 4 09:28 /etc/init/juju-nrpe-external-master-0.conf
-rw-r--r-- 1 root root 727 Feb 4 09:35 /etc/init/juju-nrpe-external-master-1.conf