Have the Chef jig creat all chef objects for a node at node create time [1/3]

This pull request has the Chef jig create the node, client and
node_role objects at node creat time, and delete the corresponding
objects at delete time.

We save the client key for each compute node at
/updates/#{node.name}/client.pem, and the provisioner has been updated
to use the saved client keys instead of regenerating them at ad-hoc
times.  Further updates will be needed to continue this pattern on
installed nodes.


 .../app/controllers/application_controller.rb      |    2 +-
 .../app/controllers/nodes_controller.rb            |    3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

Crowbar-Pull-ID: 2f1b24f34e960c236274103f8f078be858b17f88

Crowbar-Release: development