Bump upstreams Adopt: - yangtools-13.0.1 - mdsal-13.0.0 Also adopts AbstractDOMDataBroker from mdsal-dom-spi, so that we have less code duplication and maintenance. UTs mocking NormalizedNode are updated to ContainerNode, as mocking sealed classes does not work with Mockito (out of the box). Change-Id: I6d3d3c8ced297b6850aea951040d16437df9e3f0 Signed-off-by: Robert Varga <robert.varga@pantheon.tech>