ARROW-3000: [C++] Add option to label test groups then only build those unit tests#2406

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wesm wants to merge 3 commits intoapache:masterfrom

wesm:ARROW-3000

Commits on Aug 8, 2018

Add options to label unit tests then select which ones are to be built in the cmake configuration. This way we can choose to only build python-test in Travis CI, for example
wesm
committed
Only build python-test in travis_script_python.sh
wesm
committed
Fix typo
wesm
committed