SpotBugs-4.8.3 allows us to explicitly exclude classes from analysis,
take advantage of this facility to suppress Spotbugs on all classes
generated from YANG models.
Change-Id: I81a09e7ba7a1bac9ad1884b36f0bd98a7a3ecde3 Signed-off-by: Robert Varga <robert.varga@pantheon.tech>