Bug 1112, Bug 629: Migrated toaster to use BindingDataBroker

Migrated toaster example from using DataProviderService
(Hydrogen APIs) to use new BindingDataBroker service.
Patchset did not introduce any other changes,
only the minimal required set of changes,
in order to illustrate steps needed to migrate API.

 - toaster-provider-impl.yang - Changed dependency definition
 - controller.xml - Changed configuration in test
 - 03-toaster.xml - Changed configuration in distribution
 - ToasterProviderModule.java and OpendaylightToaster.java
 - OpendaylightToaster - updated to use BindingDataBroker

Change-Id: Iff0e2877b1061d10000a1e68c8ab5504cfb6c81c
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>