Fix nova db dependency

When I reordered the nova database creation for better performance
and cleaner arrangement, I broke the non-standard arrangement where
the super and cell conductors are squashed together. In devstack,
this is implemented by pointing the controllers at cell1 in the
config, which makes it hard to create and sync the databases in the
natural order. This manifested in a failure when running in this
mode (which apparently Trove is).

As a quick fix, this special-cases the setup for cell0 if that mode
is enabled. I will follow this up with a cleaner refactor of all that
stuff so this hack isn't required, but that will take a bit longer.

Change-Id: I5385157c281beb041bf67cba546be20cf9497cbe
1 file changed