Merge topics/block_storage into integration

This merge adds the following changes:
  - Block Storage service. This service allows shared access to storage
    media for SWd components.
  - Change deployment structure to support more fine grained
    configuration. Refactor deployments targeting the SWd to follow
	the new structure. This is a braking change, all integration systems
    will need follow-up changes.

For more details please refer to the documentation.

Change-Id: Ic29b901cb5d546544ffe3ff53516b23aae884217
Signed-off-by: Gyorgy Szing <Gyorgy.Szing@arm.com>