Use of the spares pool was originally recommended to increase provisioning
speed, but since Nova's server groups do not support adding existing VMs,
Octavia cannot support use of the spares pool with the Active-Standby
topology. Since this is our recommended topology for production deployments,
and speed is less essential in development/testing environments (the
only place we could recommend the use of Single topology), the overhead of
maintaining spares pool support exceeds its theoretical usefulness.
Change-Id: I7375e9758c7ae80e2370189117e8e63c79446490
29a2ec7187