Despite what the api-ref says [1], the 'bios.[*].value' field included
in responses to 'GET /v1/nodes/{node_ident}/bios' can be null. The
BIOSSetting database model in 'ironic.db.sqlalchemy.models' confirms as
much. Update the schema and api-ref to reflect this. This leaves only
the 'name' and 'created_at' fields as non-nullable.
Change-Id: Idcc03e6ce377ecf6b9db511e3283fb6f2496b037
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Closes-bug: #2127079
210d2b32bd