This makes the default database name for cell0 be based on the
main database name, not the api one. Before this, we would get
a database name of nova_api_cell0 by default, intead of nova_cell0.
This was confusing because cell0 has "main" schema inside, not "api"
schema.
Closes-Bug: #1656673
Change-Id: I86797785f76c2c927a4db8fef72b8f8d986af6b9
This provides a single command for users to run if they're setting up
cells on a new deployment, or migrating from non-cells and want a basic
setup. Cell0 is setup on the same db host as the nova_api db.
Change-Id: I73157128a3e24e49438caca1cbb19a9f5b5a7f7e