Split import UDF validation tests into new class
Split import UDF validation tests into new class

I wanted to add some UDF validation tests, but the TreeValidationTest
class was already relatively long. I split the setUp and helper function
into a base class that could be shared with multiple tree validation
test classes.

maurizi/otm-core,maurizi/otm-core,RickMohr/otm-core,RickMohr/otm-core,maurizi/otm-core,maurizi/otm-core,RickMohr/otm-core,RickMohr/otm-core