Proposed blueprint for better V3 diagnostics

Part of blueprint v3-diagnostics.

Currently there is no defined format for VM diagnostics. This BP will ensure
that all of the drivers that provide VM diagnostics will have a consistent
format.

Change-Id: I7bd2354bcf3e49992056b78b95a685b214d3b5d4
Merge "Proposed blueprint for better V3 diagnostics"