API classes changed to Callable
Added put/read/delete methods
Applied new DataBroker transactions API
Added dependencies for unit testing
Outdated classes to instantiate a SFC moved to sub-package

Change-Id: I69758c6212e1c8be81cdefbac4e7ebda41ae786c
Signed-off-by: Konstantin Blagov <kblagov@cisco.com>