Service plugins are a great way of adding functionality in a
cohesive way. Some plugins (e.g. network ip availability or
auto_allocate) extend the capabilities of the Neutron server
by being completely orthogonal to the core plugin, and yet may
be considered an integral part of functionality available in
any Neutron deployment. For this reason, it makes sense to
include them seamlessly in the service plugin loading process.
This patch, in particular, introduces the 'auto_allocate' service
plugin for default loading, as we'd want this feature to be enabled
for Nova to use irrespective of the chosen underlying core plugin.
The feature requires subnetpools, external_net and router, while
the first is part of the core, the others can be plugin specific
and they must be explicitly advertised. That said, they all are
features that any deployment can hardly live without.
DocImpact: The "get-me-a-network" feature simplifies the process
for launching an instance with basic network connectivity (via an
externally connected private tenant network).
Once leveraged by Nova, a tenant/admin is no longer required to
provision networking resources ahead of boot process in order to
successfully launch an instance.
Implements: blueprint get-me-a-network
Change-Id: Ia35e8a946bf0ac0bb085cde46b675d17b0bb2f51