Bug 933: Changed Topology Compatibility to use DataChangeEvent

Topology Compatibility adapter used commit handler to receive
change events and also reading from datastore, which may leaded
to some desynchronization issues. Changed topology Compatibility
to data change listener, which ensures data store is up to date,
when read occurs.

Change-Id: I052c9c79d99bdc8ba70e32c4421073c581901adc
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>
Bug 933: Fixed datastore processing of nested augmentations.

Change-Id: I500e2a16666dfc7730da728c0cd47076c01343b0
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>