Add support for copy offload, E-Series driver

This change adds support in puppet-cinder for the Cinder driver for
NetApp's E-Series storage solutions. It also includes support for the
new copy offload function. Both of these functions were introduced in
the Icehouse release.

Change-Id: I8a718ba19bcf9f558ddf6c96d7f19f2cf8c3e608
Closes-Bug: 1289032
Merge "Add support for copy offload, E-Series driver"