Patch novaclient to support getting keypairs.

Change-Id: I22da73279c164ecfdd18e5f8e3bdf633f2ddb7f3
Remove unused variable.

Change-Id: I4b532940fe5e26b30cf423729ceb4a64bce6fe0e
User keypair added to cluster object.

Change-Id: I300bf0687a829abb06c2bcf33a6950f6f4e71fc2