Add Release and Stemcell info to `bosh deployments`
Add Release and Stemcell info to `bosh deployments`

output now looks like:

+--------------+--------------------+---------------------+
| Name         | Release(s)         | Stemcell(s)         |
+--------------+--------------------+---------------------+
| dev117-cf-bs | appcloud/99.1-dev  | bosh-stemcell/0.5.2 |
|              | pivotal/0.7-dev    |                     |
+--------------+--------------------+---------------------+
| dev98        | vadim_bosh/6.2-dev | bosh-stemcell/0.4.7 |
|              |                    | bosh-stemcell/0.5.2 |
+--------------+--------------------+---------------------+

Deployments total: 2

Change-Id: I415324d0472a48b90ea9903e6b1f984b5be86cb5

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh