This patch implements a PXE NodeDriver class within the Baremetal
provisioning framework, which provides a means for deploying machine
images using TFTP and PXE.
This patch relies on functionality provided by the nova-baremetal-deploy-helper
utility, implemented in review 15830.
blueprint general-bare-metal-provisioning-framework.
Change-Id: I8d849601186e3dc13f10382857ff2bbc1ff1026d