PredefinedNodeTypeTest too strict

Description copied from: https://jsr-283.dev.java.net/issues/show_bug.cgi?id=808

This test check whether the standard JCR node types are exposed as defined in the
spec. Some of the checks are too strict because certain aspects of a standard node
type can be implementation variant:

• 3.7.16.1.2 "Additions to the Hierarchy": additional super types are allowed, but
  the test currently fails if a standard node type has more than the specified super
  types.

• 3.7.16.1.4 "Variant Attributes": some metadata mixins defined in JSR 283 have
  variant OPV settings and protected flags, but the test currently fails if an
  implementation differs from the standard settings/flags.