intergrate ironic python agent and/or ironic for hardware management

Ironic Python Agent provides a software defined(smart) way to program and manage hardware. It can collect hardware specs, download and write images to disk, perform RAID and firmware upgrade, hardware topology discovery, etc. It also provides a pluggable platform that could support different vendor drivers.There are two ways to take advantage of IPA capabilities: 1. Integrate with IPA directly, we write our own agent driver module and ipmitool driver, move what ironic does and what not to compass. 2. Integrate with Ironic. we don't have to write our own agent and ipmitool driver, but Ironic should be able to be decoupled from keystone/glance/neutron for image and dhcp service as standalone application.