AbstractJcrNode.addNode(String relPath) Throws Wrong Exception if relPath Has Form PropertyName/NodeName

The TCK test NodeTest.testAddNodeConstraintViolationExceptionProperty fails because DNA throws a PathNotFoundException instead of a ConstraintViolationException when the test attempts to add a child node at the relative path "prop1/node2". By spec, DNA needs to throw a ConstraintViolationException if relPath contains a property. However, DNA currently only checks for the existence of a property if the relative path has more than 2 segments.