Instead of importing wsme types directly from the wsme packages,
import them from ironic.api.types. This reduces the number of wsme
imports throughout the codebase, and confines much of the future code
changes to the new types.py and a few other files.
Change-Id: I231a1f82915ab9e07c00857aa6210c0764b8ce4b
Story: 1651346
dffc71287e