placement to multiple lxcs fails with "no unit found"

[David Britton]

I get the following warning/error if deploying multiple lxcs to a single unit of a service.

2014-08-14 15:18:08 [INFO] deployer.import: Adding 9 more units to one-lxc
2014-08-14 15:18:14 [WARNING] deployer.deploy: Service:one-lxc deploy-with Service:one, but no with unit found

ubuntu:
    series: trusty
    services:
        one:
            charm: cs:trusty/ubuntu
        one-lxc:
            charm: cs:trusty/ubuntu
            num_units: 10
            to: [ "lxc:one=0", "lxc:one=0", "lxc:one=0", "lxc:one=0", "lxc:one=0", "lxc:one=0", "lxc:one=0", "lxc:one=0", "lxc:one=0", "lxc:one=0" ]

I finally end up with one lxc placed on the 'one' service, and 9 other machines launched in the substrate.