rabbitmq user showed as being logged in

[Jonathan Lange]

If you have rabbitmq-server installed, and you run 'ck-list-sessions' on a vt, you'll get something like this:

Session3:
 unix-user = '129'
 realname = 'RabbitMQ messaging server'
 seat = 'Seat1'
 session-type = ''
 active = FALSE
 x11-display = ''
 x11-display-device = ''
 display-device = '/dev/???'
 remote-host-name = ''
 is-local = TRUE
 on-since = '2011-09-07T15:36:19.140717Z'
 login-session-id = '4294967295'
Session11:
 unix-user = '134'
 realname = 'Light Display Manager'
 seat = 'Seat1'
 session-type = 'LoginWindow'
 active = FALSE
 x11-display = ':0'
 x11-display-device = '/dev/tty7'
 display-device = ''
 remote-host-name = ''
 is-local = TRUE
 on-since = '2011-09-07T16:42:07.207961Z'
 login-session-id = '4294967295'
Session12:
 unix-user = '1000'
 realname = 'Jonathan Lange'
 seat = 'Seat1'
 session-type = ''
 active = TRUE
 x11-display = ''
 x11-display-device = ''
 display-device = '/dev/tty1'
 remote-host-name = ''
 is-local = TRUE
 on-since = '2011-09-07T16:42:28.379523Z'
 login-session-id = '4294967295'

It shows rabbitmq as logged in and using a console. This has knock-on effects, causing "Restart" buttons in desktop UIs to not actually restart (see bug 838792).

Related to, or possibly the same bug as bug 820239.