Bug 1041577: Ubuntu repository fix; r=dustin

The attached patch fix deployment using the custom APT repository on ubuntu systems. Verified on HP1.relabs.
The structure of the APT repository on relabs-puppet2 has changed a bit and will need to be propagated to production puppetmaster.

/data/repos/apt/custom/mig-agent
├── dists
│   ├── precise
│   │   └── all
│   │       ├── binary-amd64
│   │       │   ├── Packages
│   │       │   └── Packages.bz2
│   │       └── binary-i386
│   │           ├── Packages
│   │           └── Packages.bz2
│   └── trusty
│       └── all
│           ├── binary-amd64
│           │   ├── Packages
│           │   └── Packages.bz2
│           └── binary-i386
│               ├── Packages
│               └── Packages.bz2
└── pool
    └── main
        └── m
            └── mig-agent
                ├── mig-agent_201408181131+68245f0.prod_amd64.deb
                └── mig-agent_201408181131+68245f0.prod_i386.deb