Provide the default domain id and assign the admin
role to it on bootstrap.
Currently we cannot provide domain scoped tokens with
the admin user due to it not being assigned the admin
role for the default domain.
This patch makes it so we assign the proper role on bootstrap.
Depends-on: https://review.opendev.org/662992
Change-Id: Ide1918c1ed264ccc2998008b2334542e3d683bfc
d4b8f16f26