APIs should not wait on scheduler for builds in single zone deployment
APIs should not wait on scheduler for builds in single zone deployment

Fixes bug 885349

We can short circuit waiting on the scheduler if we're in a single zone
deployment and only building 1 instance.  This patch checks for that
case and creates the instance DB entry directly in the API (in
compute/api) without the call to the scheduler.

Change-Id: I98b27156167f057d11fbc56a9ff99d4e2ec423d3

n0ano/ganttclient