Make the API tests compatible with scoped tokens

This patch makes the API tests compatible with keystone scoped
tokens and the new RBAC defaults.

For example, admin system scoped tokens do not have a project_id associated
with them requiring some tests to be updated to not assume the admin
credential always has a project_id.

This patch also makes some sections consistently ordered across files.

Change-Id: Ie2c7402967f40bb90e0d97dad1c3d59f82cb6d80
23 files changed