cannot access '/var/lib/rabbitmq': No such file or directory

For Vivid-Kilo OpenStack deployments, the config-changed hook fails. It looks like either the charm needs to handle a missing /var/lib/rabbitmq path, or the vivid rabbitmq-server package needs to create it.

# from juju stat
    units:
      rabbitmq-server/0:
        agent-state: error
        agent-state-info: 'hook failed: "config-changed"'

## rmq unit juju log:
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 Setting up rabbitmq-server (3.4.3-1) ...
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 chown: cannot access '/var/lib/rabbitmq': No such file or directory
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 dpkg: error processing package rabbitmq-server (--configure):
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 subprocess installed post-installation script returned error exit status 1
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 Errors were encountered while processing:
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 rabbitmq-server
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 E: Sub-process /usr/bin/dpkg returned an error code (1)
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 Traceback (most recent call last):
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-rabbitmq-server-0/charm/hooks/config-changed", line 698, in <module>
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 hooks.execute(sys.argv)
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-rabbitmq-server-0/charm/hooks/charmhelpers/core/hookenv.py", line 544, in execute
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 self._hooks[hook_name]()
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-rabbitmq-server-0/charm/hooks/charmhelpers/core/host.py", line 312, in wrapped_f
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 f(*args)
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-rabbitmq-server-0/charm/hooks/config-changed", line 647, in config_changed
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 apt_install(rabbit.PACKAGES, fatal=True)
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-rabbitmq-server-0/charm/hooks/charmhelpers/fetch/__init__.py", line 183, in apt_install
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 _run_apt_command(cmd, fatal)
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-rabbitmq-server-0/charm/hooks/charmhelpers/fetch/__init__.py", line 428, in _run_apt_command
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 result = subprocess.check_call(cmd, env=env)
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 raise CalledProcessError(retcode, cmd)
2015-02-01 23:19:31 INFO unit.rabbitmq-server/0.config-changed logger.go:40 subprocess.CalledProcessError: Command '['apt-get', '--assume-yes', '--option=Dpkg::Options::=--force-confold', 'install', 'rabbitmq-server', 'python-amqplib']' returned non-zero exit status 100
2015-02-01 23:19:31 INFO juju.worker.uniter.context context.go:304 handling reboot
2015-02-01 23:19:31 ERROR juju.worker.uniter uniter.go:608 hook "config-changed" failed: exit status 1

## manually apt-get installing rabbitmq-server on vivid:
Setting up rabbitmq-server (3.4.3-2) ...
Adding group `rabbitmq' (GID 118) ...
Done.
Adding system user `rabbitmq' (UID 111) ...
Adding new user `rabbitmq' (UID 111) with group `rabbitmq' ...
Not creating home directory `/var/lib/rabbitmq'.
 * Starting message broker rabbitmq-server
   ...done.
Processing triggers for libc-bin (2.19-13ubuntu3) ...
Processing triggers for ureadahead (0.100.0-17) ...
ubuntu@vivid173314:~$ apt-cache policy rabbitmq-server
rabbitmq-server:
  Installed: 3.4.3-2
  Candidate: 3.4.3-2
  Version table:
 *** 3.4.3-2 0
        500 http://nova.clouds.archive.ubuntu.com/ubuntu/ vivid/main i386 Packages
        100 /var/lib/dpkg/status