heat/releasenotes/notes/stack-definition-in-functio...

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other:
- Intrinsic function plugins will now be passed a StackDefinition object
instead of a Stack object. When accessing resources, the StackDefinition
will return ResourceProxy objects instead of Resource objects. These
classes replicate the parts of the Stack and Resource APIs that are used by
the built-in Function plugins, but authors of custom third-party
Template/Function plugins should audit them to ensure they do not depend on
unstable parts of the API that are no longer accessible. The
StackDefinition and ResourceProxy APIs are considered stable and any future
changes to them will go through the standard deprecation process.