Add Nova UserInfo extention

altai-1.1:
    - Add Nova UserInfo extention
altai-installer-1.1:
    - Add Nova UserInfo extension
nova-userinfo-ext-1.0:
    - Initial implementation
python-openstackclient-base-2012.1:
    - Support for user's keypairs provided by gd-userinfo extention

Change-Id: Id7b6beaadafac53f9143807694107cdad8ac1165