[cinde] Cinder cookbook should support multiple backends

We should be able to set multiple cinder storage backends and name them so we can add them as a filter for volume-types:

cinder type-create SATA
cinder type-key SATA set volume_backend_name=cinder-sata
cinder type-create SSD
cinder type-key SSD set volume_backend_name=cinder-ssd

# create a 1GB SATA volume
cinder create --display-name test-sata --volume-type SATA 1

# create a 1GB SSD volume
cinder create --display-name test-sata --volume-type SSD 1

At a minimum this resolves the problem for cinder and LVM: https://gist.github.com/rackerjoe/9920058. With this gist you can set a default in the node attribute to define the backend name like:

54321-cinder01.domain.com
    "cinder": {
      "storage": {
        "lvm": {
          "volume_backend_name": "cinder-sata"
        }
      }
    }

12345-cinder02.domain.com
   "cinder": {
      "storage": {
        "lvm": {
          "volume_backend_name": "cinder-ssd"
        }
      }
    }

The default attributes for cinder storage needs to really support multiple backends and enable the backends per node. something like:

enabled_backends=backend1,backend2
[backend1]
...some values...

[backend2]
...some values....

[backend3]
...some backend that isn't enabled...

This allows us to mix and match the cinder storage backends on one or more cinder-volume node and doesn't tie us to a single backend per storage node as we do today.

rcbops / chef-cookbooks

[cinde] Cinder cookbook should support multiple backends #924