In this changeset, I updated the architecture documentation
about the Decision Engine by adding a new sequence diagram
outlining the CDM synchronization workflow.
I also explained the default 'period' parameter used in the
CDMC plugin.
Change-Id: I09790281ba9117e302ab8e66a887667929c6c261
Partially-Implements: blueprint cluster-model-objects-wrapper
4f8591cb02