Refactor deliver to use generated mocks and demonstrate
unit testing via ginkgo.

Change-Id: Ib00fec78bc0be9b22f977748185b8c4879d77f0c
Signed-off-by: Matthew Sykes <sykesmat@us.ibm.com>
Signed-off-by: Will Lahti <wtlahti@us.ibm.com>