For demonstration purposes, I added a vector field to one of the data
sets (the cow nose). However, the serialization test was not expecting a
field of that type and therefore had not compiled the case to serialize
that type of field, which caused a failure. Fixed the problem by
instructing the test to also consider the correct type of vector fields.
`vtkm::cont::testing` now initializes with logging enabled and support
for device being passed on the command line, `vtkm::testing` only
enables logging.
Implement more general versions of `test_equal_ArrayHandles`, `test_equal_CellSets`, `test_equal_Fields`, and `test_equal_DataSets` functions and put them
in vtkm/cont/testing/Testing.hi with the hope that they will be useful for
others also.
