Added random-number generator info for instance creation

Added hw_rng_model to image property keys and hw_rng
information for flavors. Updated <replaceable> values
to use uppercase, per new convention.

Closes-bug: #1284835

Change-Id: I44b3f4fd03cd542e328e8334ded3379e4114cffd
Merge "Added random-number generator info for instance creation"