Porting nova pxe driver to ironic

Implements: blueprint equivalent-pxe-driver

Change-Id: I59cf6e10ff00b3787e2bd60082ca872348157ec8
Add missing foreign key

Chassis table is created after nodes table, there
is missing foreign key nodes.chassis_id -> chassis.id.
This patch adds missing FK in separate migration.

Change-Id: Ic82181c7aa85515a5a2bba49c8dc8d35b495742c
Sync models with migrations

Ironic project use migrations for create DB.
There is difference between DB after all migrations
and models. This patch fix models and sync them
with real DB state after all migrations.

Change-Id: Ic2c44519d51699b2223d8252baa6a3da1f412795
Merge "Porting nova pxe driver to ironic"
Merge "Add missing foreign key"
Merge "Sync models with migrations"