Migrate from using the deprecated SchemaContextProvider

org.opendaylight.controller.sal.dom.broker.SchemaContextProvider has
been deprecated, the services away so it is no longer used.

Change-Id: I6c84b2fe6ce02dce71aed4e4c24f8bc84ba078d8
Signed-off-by: Robert Varga <rovarga@cisco.com>
Deprecate ForwardedBackwardsCompatibleDataBroker

It implements a deprecated API only, so rather than suppressing the
deprecation warnings, deprecate the entire class.

Change-Id: If7159c3960b3ca2707bb4b9c716e95ed38ddb394
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge changes If7159c39,I6c84b2fe

* changes:
  Deprecate ForwardedBackwardsCompatibleDataBroker
  Migrate from using the deprecated SchemaContextProvider