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ARROW-1540: Add NO_VALGRIND option to ADD_ARROW_TEST and disable valgrind in a few problematic tests

It turns out that using valgrind with CUDA out of the box just doesn't work that well. There were a couple other tests that fail in some valgrind setups so I disabled those, too. Everything else should valgrind cleanly.

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #1181 from wesm/ARROW-1540 and squashes the following commits:

f8a6aced [Wes McKinney] Add NO_VALGRIND option to ADD_ARROW_TEST so certain tests can be excluded from valgrind-enabled runs