Updated openstack/openstack
Project: openstack/nova  df3674ab574d5e87c8bb5b25a3fa296bc3af3aa9
null
More instance_type -> flavor renames in db.api

Renames the instance_type methods in db.api to flavor and converts the
tests to match. Updates doc strings where needed.

Note that this patch doesn't rename anything touching the db models for
instance types, that will be handled in a later patch for the blueprint.

Part of bp flavor-instance-type-dedup

Change-Id: I397421c9b34d295368999c5d085345409945151a