Adds Ironic API response models/tests

* Adds Ironic chassis, node, driver, and port response models
* Added unit tests for new models

Change-Id: I280883330d6dd28562625006acc769afc1e0857e
Merge "Adds Ironic API response models/tests"
Adds Ironic request models

* Adds request models for chasis, nodes, and ports
* Adds unit tests for request models

Change-Id: I34d49a003a6cbc6e4f3622f036318a51769451a4
Adds basic client methods for Ironic

* Added basic API operations for chassis, drivers, nodes,
  and ports

Change-Id: Id1cea2a1a4eb1557b4957f5b3dddeede1aea3adb