Part of blueprint versioned-rpc-apis.
One side effect of this change was that nova.scheduler.api was removed
in favor of nova.scheduler.rpcapi. In this case, the api was just a
direct wrapper around rpc usage. For other APIs, I've been following
the pattern that the rpcapi module provides the rpc client wrapper, and
if any other client-side logic is needed, that's where an api module is
used.
Change-Id: Ibd0292936f9afc77aeb5d040660bfa857861eed1
21e9d2e2b7