ubuntu.common.conf: mount /dev/mqueue

systemd wants it.  It doesn't seem to be a big deal, but it's
one fewer error msg.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>

config/templates/ubuntu.common.conf.in

@@ -5,6 +5,7 @@ lxc.include = @LXCTEMPLATECONFIG@/common.conf
 lxc.mount.entry = /sys/kernel/debug sys/kernel/debug none bind,optional 0 0
 lxc.mount.entry = /sys/kernel/security sys/kernel/security none bind,optional 0 0
 lxc.mount.entry = /sys/fs/pstore sys/fs/pstore none bind,optional 0 0
+lxc.mount.entry = mqueue dev/mqueue mqueue rw,relatime,create=dir,optional 0 0
 
 # When using LXC with apparmor, the container will be confined by default.
 # If you wish for it to instead run unconfined, copy the following line